Walk-in shower with floor-to-ceiling tiles

Without or with few grout lines, it is easier to clean.

Oh I see....... but why do you have staff walking around the house in rows of three? In my opinion, the savings from this labor effort should be rather limited (I need about 20 seconds for that), and the cleaning argument could rather be brought up in other places in the house, such as number/position of windows, furniture surfaces, kitchen, etc. But I also belong to the type of person for whom using light switches, lawn mowers, or manual window ventilation does not feel like unnecessary extra effort, so I'm probably not the most suitable advisor here. On the other hand, I have saved myself the outside cleaning of my precisely because of that old car for many years, because it would be totally annoying for me; I don’t use a car wash either, because even without it I get to the next cafe.

Of course it will be significantly more expensive to install such a tile (if you can still call these huge things tiles at all). At the moment, you see this everywhere in showrooms just as it is with the currently trendy, expensive fashion trend.

I thought exactly the same when reading the opening post.

I don't even find the very large-format tiles beautiful.

... and I don't like them either. I like the play of grout lines and tiles together.

I also don’t quite understand the frequent attempt to necessarily avoid grout lines or, for example, brackets of elements in the shower/bath area.

Me neither.

Without or with few grout lines it is easier to clean.

No. You don’t clean each tile individually, nor the grout lines separately, but you clean e.g. 2 sqm of surface, whether large-format or small. For example, we have the shower front with mosaic: it is wiped dry after showering and done. I even dare say that lime or shampoo residues are more visible on a continuous surface than on a surface broken up by grout lines.

The dirt remains stuck in the joints but less on the tile. And a smooth surface without joints can be wiped off more easily after showering, for example.

If you care about seamless surfaces, why don't you make a seamless bathroom without tiles? For example, offered by the company Dold.

The dirt stays stuck in the joints

If you clean the dog there every day and it's about the floor, then I agree with you. The floor needs its non-slip effect anyway, whether with joints, rough surface, or texture, so something can "settle" there. On the walls: what kind of dirt from whom should "catch" there? As already said: we have 2x2 mosaic there, there is no dirt - the joint looks like on the first day. Built in 2013.

In my opinion, seamless can also be beautifully achieved through spatula technique. In our house, MSM Crearev is applied in the bathrooms. Here, there are also various design possibilities. Of course, you have to find a suitable specialist company for this, but the problem obviously also exists with large-format tiles.