In Europe those are usually in bathrooms with all tile floors and were probably installed at the build stage. IMO unless you need to be able to wheel a wheelchair into the space do a curb and save a lot of money and hassle to do this after the space is built . Do you like wiping up the floor after every shower becuase thta is what happens with no curb.I assume you were in hotels where someone else cleans the bathroom. This change requires a person with the know how to do this right .

In Europe, there is a defined trade apprenticeship, ensuring competency of contractors. Here, the wood frame construction is easily damaged by moisture, and there is zero assurance of past training, or current competency, if someone holds a contractor license. Contracting without a license is also rampant, and usually given a rap on the knuckles. Things are planned and done differently.

Our rental house during our 13 month remodel had a curbless shower it was the worst! Water leaked out onto the floor after every shower. I was constantly mopping up the floor and the bathroom was always damp. Also, since the door is so low to the floor, you can’t have a bathmat - opening the door just moves it away. Plus the bathmat gets sopping wet anyway…I would avoid this scenario at all costs.

We just put in a curbless shower. The door opens both ways to prevent water getting on the floor after a shower and we can have a bath matt outside. We’ve showered in it for about 2 weeks and no complaints. We did have the installer come back and put another short piece of clear plastic between door and tile because water was getting out there. The sweep touches floor to prevent water from getting on floor.

As others have said, adding a curbless shower to an existing bathroom is difficult and expensive. It's much easier to do it in a new build. The shower has to be appropriately sized, and the slope must allow for run-off; this is hard to do on a floor that already exists.

A better option is to go with a minimal curb, which is probably 2". That's quite short and would make stepping over considerably easier than the typical 4-6" curb.

"As others have said, adding a curbless shower to an existing bathroom is difficult and expensive."

Not any more.

Video.