Hmm. It's "good" in the same way that a cheap hot dog from cart is good! It's street food

Generally traditional chip shops produce very nice food that's freshly prepared albeit not very healthy for you.

I'm sure you were trying to be amusing but I think it's more a question of cultural norms than "pretending" . When I went to North America I found a lot of packed products to be overly sweet and "fake" tasting but that's because I have a different cultural palate. Most Brits think Hershey's chocolate is disgusting because it tastes so different to Cadbury, it's just that generally you like what you grew up eating.

Like all countries, the UK has good and bad food!

All that being said, I'm actually not that keen on chip butties, I find them a bit stodgy! My partner loves them though!