I believe most people accommodate for terminal iso, which might be different to something like uk iso, which has the key.
I feel that a lot of the more popular sets have the option, whether it's uk iso in the base/extensions kit or a nordeuk. You can definitely tell who is inexperienced in kitting if there is just terminal iso support or even any iso support at all (only excuse that's acceptable is if it's a set that definitely not sell well, like a niche dcs set)
Because Hobby is ANSI centered and people don't give a **** about ISO nor understand what ISO support is.
I feel that more experience designers do care about iso users, however a lot of the new designers don't care since they most likely use ansi, which isn't great.
There are some designers catering sets to iso users and europeans, like gmk blanc sur noir and NorDe (which is instock on oblos website which is neat) which is cool to see, love seeing these options available even if I don't use them personally.