I agree with a lot of what has been written. It can be insular and parochial, and there are some very ignorant people around and about, but you get that pretty much anywhere, in slightly different forms.
If you are seriously thinking of a move, then do your research and make sure you move to a village with a thriving community, and as mixed as possible (which is not saying much in Cornwall, eg there is one black school kid at my dc's primary).
It's about state of mind for me. Sometimes, it could be the most beautiful sunny day and I might still think 'bloody hell, if I didn't have kids I'd move back to a city'. It IS isolated, and isolating, if you haven't got the tools to tackle that. I also miss the culture aspect. You do have to travel for things like good theatre, but then again you get pretty eclectic, interesting stuff here, as well as the more mainstream theatre tours from London.
State of mind/attitude again though-the reality for me when I lived in a city was that I'd go past a theatre and think 'oh that looks good' but it didn't mean I'd go and see it!
Travel is a pain, but then again so is travelling in a city. My commute now is 15 minutes, though previously it has been over an hour ar good jobs are few and far between (I'm a solicitor). However, once you get your foot in the door and work somewhere for a couple of years, you would soon be familiar with the area and be able to watch out for preferred jobs coming up.
My children are primary age and they adore it here. I can foresee a time when they will not love it so much, and I am totally up for moving on at that point, if it comes. By that I either mean a move into the nearest town, or back to a city or the suburbs to give them career opportunities or whatever. Wherever their paths take them.
I have made some amazing friends. I feel like an integral part of the village in which I live, which is a good mix of people from all over plus locals. There are some negative attitudes from a couple of backward dickheads about incomes, but they are soon shut up when challenged. If small coastal resorts were only ever occupied by people born there they would be mummified and die out.
The internet isn't bad here believe it or not. I'm right in the sticks and I've got superfast etc etc. Took me an age to get it sorted(more to do with BT and Openreach being unremittingly crap as per) but all good now.
The countryside and the beaches do go a long way to make up for any of the downsides.
I feel like posting the view from my bedroom window but you might hate me so I won't 