I believe it is completely self contained so you aren't pouring steam all over your entire bathroomWhat is a steam shower? Does that turn your shower into a quasi-sauna? If so, I can't imagine most bathrooms(drywall, paint, etc) would do too well with that much steam/humidity regularly.
It seems like that would be a nightmare to clean and after a few years your entire grout would be blackWhen I redo my master bath I hope to tile every surface and put a steam shower in. I love steam showers, I love to sit in steam.
Consistent cleaning and resealing the grout periodically would help.It seems like that would be a nightmare to clean and after a few years your entire grout would be black