I'm pretty sure that being at the beach is really just universal marketing shorthand for "being somewhere that no one would ever expect you to even reply to emails from"
Or more generally, just doing whatever you want. I dont think anyone literally wanted to sit on a beach 24/7 365 days a year. However plenty of people would want the ability to just wake up one day and on a whim fly to a hawaii until they get bored then fly somewhere else.
If you pay for beach accommodation instead of a dwelling in some higher-priced metropolitan area, sure. As an add-on though, still more expensive.
I'd wager that most people are working towards a home base in the lands they're used to, then go on trips every now and then. Selling your metropolitan home base gets you the permanent beach lifestyle for sure, but permanently removing oneself from more densely populated areas is not for everyone.