Even our small independent theater in town has reserved seats, some of which are couches.
Maybe in fancy theaters, but in most places it started during covid (and just never stopped)
My experience, being discussed in another thread, is that only big commercial multiplex do it, many small cinemas with more alternative content, usually don't do assigned seats, only ticket reservations.
Personally, I like being able to select the exact seats and pre-order popcorn and soda and just have it show up to me right as the trailers end.
Then you have smaller cinemas with indie movies, european movie festival rotation, etc, and many of those in at least 4 or 5 countries in Europe I can confirm do NOT have assigned sitting.