Construction costs are currently skyrocketing

THEN it should be done consistently. That means: There is no more social assistance and everyone is truly responsible for themselves and their own life, so abolition of citizen's income etc., no more payment of rent, and you only get medical treatment if you effectively pay contributions yourself.

I find THAT fair

Quiz question: WHY should that be fair?
We get our starting position in life by a lottery of sperm, so it starts already maximally unfair.

Analogous to your felt fairness would be that a wheelchair user competes against an athlete in 100m. That is then fair because the distance is the same for both.

Equalizing is not the same as making fair.

I don't really know of water being used for garden irrigation in the long term. But maybe my sample size is just too small, feel free to convince me otherwise.

It depends on what is being watered in the garden. If you water the lawn with 15 liters per square meter every week, then a normally sized cistern will be empty after at most 2 weeks. You have to build on a scale like Rick and also have correspondingly large roof areas (my cistern received maybe 2.5 cubic meters from last week's storms). If you only water the vegetable garden, a few flower beds, and a handful of young trees (well-rooted ones don’t really need it), then that lasts quite a long time even in dry periods, and on Saturdays you can use the rest to spray your car. To prevent a cistern from becoming stagnant, it’s usually enough that it is emptied regularly. I personally also find it odd that infiltration and retention are now mandated, but not usage in the household and garden.

It depends on what is being watered in the garden. If you water the lawn every week with 15l/sqm, then a normally sized cistern will be empty after no more than 2 weeks. You really have to build in dimensions like Rick and also have correspondingly large roof areas (my cistern received maybe 2.5 cubic meters from last week's storms). If you only water the vegetable garden, a few flower beds, and a handful of young trees (well-rooted ones actually don't need it), then that lasts quite a long time even in dry periods and on Saturdays you can still use the rest to wash your car. To prevent a cistern from going bad, it's actually enough if it is emptied regularly.

I personally also find it odd that infiltration and retention are now mandated, but no household or garden use.

I think the emptying is probably the crucial point. Or rather - what does regularly mean in this context?
How does it behave over late autumn and winter, when there is enough rain or you no longer water? Doesn't the water go bad then?
You probably only get a cistern completely empty regularly with a lot of effort?

No, that is clearly not fair. Are you aware that you want a world in which only the strong survive and that you would then be one of the first who not only cannot afford a house without personal contribution with lofty demands, but would also have to slave away in a factory without labor protection and health insurance with a life expectancy of 40 years every day (what’s with Sunday, socialist nonsense) 16 hours, and if you don’t meet your quotas, then off to the press you go and stop wasting resources!

The welfare state and the constitutional guarantee of human rights is the greatest social achievement of the last 100 years and you are trampling on it.

Analog to your felt justice would be that a wheelchair user competes against an athlete over 100m. That is then fair because the distance is the same for both.

No, the wheelchair is unfair to the one who only has to run with legs! The Be****i is supposed to crawl over the distance in the eyes of ! In the world you drool over, there is no place for freeloaders. Do you actually tell your grandparents at some point that they should just take the golden shot because you don't want to care for them and a state nursing home is incompatible with today’s resource situation?

I’m really getting chills down my spine right now. I thought such opinions would simply die out with a certain generation, but having to read this from a young woman around 30 really makes me doubt our education system.

We get our starting place in life through a lottery of seeds, so it already begins maximally unfair.

This is the most important insight when it comes to poverty and wealth. And this applies to all people in the world. I believe this is one of the most important things to internalize. Always keeping this in mind should make a person grateful and at the same time generous and merciful toward those who have drawn a worse/bad lot in the lottery than oneself (especially migrants, refugees...).
Because wealth/property is randomly distributed from birth, societies cannot function well except through solidarity and mutual support as well as a certain leveling of the strong differences (yes, long-term redistribution of wealth is also important) – or else they end up in civil war and chaos (a combination of slums vs gated communities like in South Africa belongs to this in my view).

I think the key point is the emptying. Or rather – what does "regularly" mean in this context? How does it behave during late autumn and winter, when it rains enough or you don't water anymore? Doesn't the water go bad by then? You probably can only get a cistern completely empty with great effort regularly?

Unfortunately, I can't answer that in detail, especially regarding autumn/winter. I don't know anyone whose cistern has gone bad. Completely empty here doesn't mean pumping it out to the last drop. If you still have 100 liters inside and it rains 2 cubic meters, then it is also very well diluted. Every few years, you should also thoroughly flush the cistern once in summer and scoop out the sludge at the bottom.