Interior walls made of Poroton or calcium silicate brick?

Soundproofing can be accepted as an argument, but dowels? What do you want to hang on the wall anyway? Even if you actually need "special dowels," those are not in large quantities. By the way, an 85-inch TV does not weigh 50kg and is attached with more than one screw...

TVs, toilets, washbasins, kitchen wall cabinets...

TVs, toilets, sinks, kitchen wall cabinets...

Usually, almost all of that is done by companies during construction and you don't really have to worry about it. Or do you mean they'll give you a discount on plugs?
And even if you do it yourself, the cost for special plugs will never reach a four-digit amount over the entire life of the house.
It holds up for others too without having to sit on the floor with the toilet.

Don't get crazy about it! I have a 75" TV including a 5kg wall mount hanging on an 11.5cm Poroton wall. Nothing is happening there at all! I used completely normal dowels for it.

Edit:
Meanwhile, the TV program is so shitty that sometimes I wish the TV would just smash itself on the floor.

Is a main advantage of ks not the mass that serves for good heat storage and thus keeps the temperature more constant both in heat and in cold?

With Poroton, you just have to be careful to switch the hammer drill from hammer drilling to normal drilling. Otherwise, the entire brick will come at you.