Dual vanities/basins (at least in an en suite) is not uncommon. (Edit: was looking at wrong bathroom - yes, very weird there.) Nor having separate bath and shower.

We had both in our last house which was a mid-range build and not overly expensive at the time (very cheap in hindsight).

Not commenting on the placements though. Looking at the floorplan, it’s a pretty silly layout that could at least be used as a starting point then tweaked, but at that point you might as well start with an off the shelf plan first. Reminds me of a procedurally generated dungeon game.