Is a rainwater cistern worthwhile for garden irrigation?

These are my times, it doesn’t work any other way.
The purpose of withdrawal times doesn’t quite make sense to me. It might relieve peak times, but probably doesn’t reduce the amount of water. Especially those who water automatically just reprogram and that's it.

Uh yes, those who water during the day water more overall, because most of it evaporates and the plants get nothing from it. Actually logical, isn’t it?

In both cases, it is better to water at 6 o'clock than at 8 o'clock as long as ceteris paribus applies. And with such prohibitions, it often also applies that watering with a watering can is permitted after all.

Evaporation is always a problem. But then the mulch layer, soil compaction, and the type of irrigation etc. must also be taken into account.
Is the sprinkler at 6 a.m. on unmulched, rock-hard soil better than the watering can/hose targeted at the plant at 8 a.m. and the soil is protected by a mulch layer?

Here, watering green and garden areas is generally prohibited during the banned times. From wells, drinking water, and rainwater. No exception for the watering can.