In architectural design, what is the better idea of the spatial division of the bathroom?

I don't know what you want to ask about the bathroom in the residence (ensuite, villa, office?) ) or the interior of the bathroom.

Generally speaking, there are two main considerations in the space design of residential bathrooms. One is the human scale, and the other is the control of water and temperature. The former is generally used to compress the bathroom space, but it is actually a very important part of a good design, how wide and high does the pool basin need to be, and in which direction will the bathroom door be opened without hitting people?

How far away does the toilet need to be from the wall, and does it need to have a hand out of reach when sitting on the toilet so that you can put down your phone while wiping your butt? Toilet paper hanging there without twisting your arm at a weird angle to get to the paper?

This is followed by water and temperature control. Bathing usually requires removing clothes - walking in - waiting for hot water - bathing - wiping water - changing clothes (including changing shoes), consider this process, reasonably allocate the dry and wet areas of the bathroom, exhaust and dehumidification equipment, insulated bathroom doors, bath bombs, air conditioners, floor drain strips, and integrate the walk-in changing room and toilet design, etc., you will find that you have a variety of ways to increase the use of the toilet experience.

Hope it helps.