No really, I hadn't noticed this until coming to The Flea Market. But, my daughter has assured me that it's the way it's been in all the hotels too. Surely my shower in Germany had an actual base that was raised from the floor, didn't it? I would have noticed this. But, yeah, it appears this is standard issue here in Sweden. The shower floor and the floor are one.
Notice the piping and faucet in the photo. That's the shower. Standard Operating Procedure: you just hang a curtain and you are good to go.
Doesn't the floor get all wet you ask? Yep, pretty much.