You will see tiles everywhere in everyday life that are pieced together, fiddled with, or
With larger-format tiles, there are fewer joints in the surface. The consequence, that the eye then sticks more to the individual joint, usually only becomes apparent to the builder during execution (since exhibition installations are usually planned accordingly meticulously).
What exactly counts as part of the floor structure? Apparently also the concrete poured onto the filigree slab,
In your terminology world, the significant difference between topping concrete and screed has obviously not been grasped. A "filigree slab" (by the way a trademark) is not a slim, finished slab, as the name apparently makes many builders believe; and which you probably think simply gets a layer of concrete poured over it on site. Rather, it is a semi-finished product made from reinforcement and the lower concrete cover (which as a whole basically already represents the formwork in itself), onto which the upper concrete cover must then be poured from (ready-mixed) concrete.
But why don’t you hide the empty conduits for KNX also in the raw floor?
Without going into protective and empty conduits here as well – before you still spoke of controlled residential ventilation (which uses neither) and now of KNX, I hope you’re not lumping those in the same category too? – the upper concrete cover is statically necessary and should not be weakened.