Yea, that tub is curious as hell. It’s too small to take a normal bath, but it’s large enough to make terrible use of space! It would have been much better to just put a shower stall there (and perhaps washer/dryer combo).
That being said, when I was looking at houses to buy, I walked into the back door of one and saw a shower. “Oh, is this like a mud-room shower?” “No, this is the shower for the house. There’s one toilet upstairs.” “…okay…”.