Depending on where I am playing, most halls here have 4.25" standard. 4.5" is mostly found in the bar. There is only one Hall I have been to that had 4 x 4.5" tables (sat lonely amongst three rooms worth of Chinese-8 tables).
The hall I go to the most often has 16 x 4.25" and then also has 4 x 4.125" and one Diamond 4" - the other branch of this company I go to sometimes has 16 x 4.25" 4 x Chinese-8 and one Diamond 4" - I haven't been to their 3rd store.
I think 4.25" is pretty much the standard here (and can be seen across at least three chains that operate in the city, and some smaller halls), and 4.5" gets treated with a bit of a disdain... People here do have a very different idea of what 'good' looks like, or what 'hard' is. They also are much, much quicker to adopt the most popular, or newest things (MR break box, grey cloth, black balls etc etc)
Pickleball makes me want to vomit. How on earth that ever became popular is anyone's gue....oh wait, it's not a guess. It's middle-class morons lapping up expensive tat

- I guess in the past, pool is to snooker, what pickleball is to tennis...Although, I wouldn't put it in the same category now.
Thanks for adding your perspective, definitely see what you are saying in some areas. It's a really complicated balance between; what is watchable? to who is it watchable? is it playable? to who is it playable? is smaller making progress? to who is it progress?
Where did you grow up? I wish I grew up somewhere with access to 9ft pool tables and snooker, I feel I probably would have gravitated towards it much earlier.