It's very much circumstantial too.
I'm 34, single, no kids.....so why the fuck would I holiday at home?
I'm fortunate to be in a position to be able to go wherever I want, whenever I want (obv subject to finances and whatnot) so it just wouldn't make sense to me to use my precious annual leave, that I work hard for, against a holiday in the UK.
Even with the very limited foreign options once Covid hit, I've managed to get to Zante, Halkidiki, Majorca, Gran Canaria, Madeira, Perugia and Porto since July 2020.
Just before Covid went crazy I was out in Philippines for 2 weeks....what that cost me for that trip would likely only get me 10 days in Devon in the August school holidays.
Perhaps when I'm older, or if personal circumstances change, then I might start seriously considering domestic holidays but for now they hold no interest to me whatsoever and I make no apologies for that.
Perhaps the high horse posters instructing people to holiday in the UK will finally grasp that not everyone wants to, for a myriad of valid reasons.