I had the stars but I also had a bunch of other space themed stuff too. I think it was something like this. I don't think we used the super big stars though.
It's an age thing. Being taught one thing and having it changed seemingly arbitrarily bothers some people. Most Americans don't know Pluto was discovered by an American. Afaik if we kept Pluto as a planet then we would have to make room for Eris, Makemake, Haumea, Ceres etc.
The house where I was growing up had wooden beamed ceilings so these wouldn't really work. They're ideal for houses with white drywall ceilings where they'll blend in perfectly during the day, and also because houses with drywall ceilings have smooth continuous surfaces to apply them to.
The beams in that house weren't painted, they were just bare wood (maybe stained). They might have stuck to them still but it probably would've looked ugly and been very noticeable since it was also darkened with age.
The bigger issue isn't just if they'll stick to the beams but if they'll look at all good when they do. I'm betting they'd look really ugly stuck to those old darkened wood beams.