I am born and bred British, and in my 60's. You sound as if you are somewhere between late 20's and early 40's as your children sound as if they are still quite young?
I think that my age must be relevant, as to me, England at least (I have only ever lived in England, but have holidayed in the other UK Countries and enjoy all of them) has got progressively worse over the years, and Covid has not helped with that at all!
There are many jobs vacant in hospitality, so service, or even the availability of booking a table at one of the pubs or restaurants that have managed to stay open after the Pandemic, can be rather haphazard. Many government offices (particularly local government ones) are still not fully open, and Covid is apparently increasing again, so things may be shutting down again, or closing early as staffing levels across the board are getting ridiculous. If you want and expect to see a GP forget that, if you do manage it, then you have probably struggled up a steep hill to do so. If you have popped back here in the last few months to see patents etc, then you might not have noticed how dismal things still are - and they were going down hill before Covid anyway.
The cost of living here is prohibitive and getting worse, but that might be the same where you are, you hopefully haven't been too affected by Brexit, but the Russian attack on Ukraine is I believe affecting a lot of the World, not just the UK, or even Europe? I think your education system would have to be particularly lacking (especially if you use International Schools, as in the past many of them have been excellent), to think that the UK's system would be any better, they have suffered dreadfully over Covid, and certainly haven't returned to pre Covid standards yet.
A few of the posters on your thread OP, have talked about surfing, and BBQ's at the weekend, imo that is as rare for normal weekends as you would expect it to be OP. I am not doubting that that is their lifestyle, I just don't think it is a common one. We have started a few days of lovely weather that are expected to turn into a heatwave as the week progresses, but as you must be able to remember, that is not the norm in the UK!
I have lived in two seaside towns OP, one on the South Coast and it was amazing, but even then, it was only the very hardy, and very committed few, that made outdoor activities a year round thing, especially if they had young children. The life I see being led by my adult children and Grandchildren, and other friends and relatives, is usually just about how you described it, except as a PP pointed out, many of the high street shops have closed down now, and online shopping has taken off big time, with apparently Amazon as king!
Your posts OP make me think that you probably live in a European Country that borders the Mediterranean, maybe Italy or even Greece, but with Spain and Southern France as obvious contenders too. I am wondering if where you live also still stops for siestas, as that does suggest a more laid back lifestyle, swimming pools as normal, and flexible working hours. If you live in any of those places - even Greece, you can return to the UK quickly and easily, without it costing you a fortune (except of course for Covid, strikes, price hikes etc, but hopefully they will get more back to normalish, soonish!).
But what strikes me most about your post OP is that you sound very happy there, and settled, you love the lifestyle, please don't give all that up. If my children lived happily abroad like you do, I would hate them to give up their wonderful lifestyle for me, and so would their Dad. If your parents are well enough to travel, spending longish holidays in the winter with, or close to you where you live now, would probably be so much better for both their health and enjoyment, and you could hopefully spend at least a couple of weeks with them here, in the summer. I would not be well enough to fly to see my children, but I would still hate them to give up a lifestyle like yours (and who knows when I or their Dad will die, and they could be stuck here then, trying not to resent us for them giving up such a lovely lifestyle that they and my Grandchildren would have benefitted from greatly). Selfishly, I don't want to go to my grave feeling guilty for my children upheaving their lives for me and their Dad.