I have sat in cafes minding my own business, the only bit of child free time I had outside of work, only to have mumma and her 2 little poppets join me on my table without so much as a by your leave.
They have played with food, and tablets, made a noise and a mess, but that's Ok cos Mumma needs a cuppa and a rest from parenting.
It's RUDE to think that your right to take time off from parenting trumps someone else's right to a bit of peace and quiet or enjoyment of some time to themselves. If you are at the end of your tether, that's one thing, but it doesn't get to override the experience of someone else.
I don't want MY kid free time ruined by someone elses kids. ever.
Kids are kids, we all know they are not silent, don't have an off button and all that, but our job as a parent is to give them the tools to navigate situations and experiences with consideration for others.
In kid space, they have 'rules' they work to, play nice, don't hit/run near the pool, listen to instructions etc etc.. in adult spaces there are 'rules' too, and giving kids tech to tranquilise them is storing up huge social problems for the future.
Our secondary school bans all phones during school hours. the reason for this is that even age 11+ kids won't socialise or make friends with other kids if they have phones.