It always depends on what you intend to do with it. Is it generally about raising the ceiling by half a meter or more, or does it only happen on individual walls because, for example, the roof is a shed roof or the living room is "lowered" to create a bit more volume and effect.
In the children's room, I find 3.5 or 4m great, as you can install 1-2 staggered levels with wood and a lot of craftsmanship, creating a play paradise. In your own bedroom, I would only find it stylish if I also install a loft bed myself to be able to use the space underneath sensibly. In the kitchen, it makes sense to stop where the 90cm hanging kitchen cabinets end.
In the end... totally a matter of taste and wallet.