I respect people who've tried something and decided it's not for them. But to never even try a different kind of food? I suspect it's less that he's found what he likes and more that he's scared he'd find out he actually liked something else better, and has wasted those 10 years.
How incredibly patronizing.
Have you considered that people have different tastes? Personally, I hate eating; if I could take a pill to replace all my nutrition needs, I would in a heartbeat, even if it costs more than my current dietary expenses.
I think "stick with what you know" can be a sound strategy if you are loss-averse and generally content.
Yes. If he'd tried eating a variety of foods and hated it, I'd say fair enough. But how can you possibly know something like that without having tried it? To just dismiss so much of human experience without even considering it is honestly tragic.
Don't knock it, though, there's something to be said about this level of extreme stability. It simplifies a lot of life's worries.
You can go out in the valleys right now and ask someone, ~40 years after the mines were shut, whether they'd want the mines back. And a significant proportion would say yes without pausing.
I went to university with a guy who turned around to me one day and said "I never want to leave the Rhondda". Not sure what he does with his design degree up that way but I'm sure he's happy.
There's a great tie to family and friends and where you live, here, which has somewhat died out in the south of England. I hope it survives even as more travel to experience things elsewhere. Of course the south of Wales does have one advantage that was taken from elsewhere, and that's that it's possible to live cheaply in the valleys and commute into the cities by train for work, so it's possible to do both here. I feel like England lost this somewhat with the Beeching report ripping half the rural railways out.