I’ve stayed in hotels throughout Europe and have found that shower curtains are almost non-existent, and glass shower enclosures don’t cover the entire shower. Why is that? Is this one of those weird things like the gap in the bathroom doors on North American bathrooms? How do you shower without getting water everywhere?
If the bathroom is designed for it you don’t need to worry about not getting water everywhere.
Not sure that’s a sufficient explanation. So I will elaborate for the OP:
Some designs are called a “wet floor”, which means the whole bathroom floor is sloped toward a drain even outside the shower and beyond the showerpan. It’s seems to be a design in cheaper establishments, like cheap hostels. It works but it can be annoying when the floor is still wet when later entering the bathroom in socks or something.
Some designs are more luxury, and have a really big shower pan. A big area is sloped within the shower as an elegant “curbless” design which is great for elderly and handicapped people who might struggle to step over a shower curb. The shower pan is big enough that if the drain is slow or clogged, a fair amount of water can build up without overspilling into the rest of the bathroom.
Probably just faster and easier to clean for the staff.

