Its probably more of a me "problem". But I'm sure there are plenty of others that share my sentiment. It doesn't really have anything to do with it being familiar, familiar can be good, but what I'm talking about is a familiar ugliness and lack of intention.

The Stripe or Shopify checkout is familiar, but it only became familiar because it was well designed and people wanted to keep using it.

Also when its obvious someone used an LLM, it bleeds into my overall opinion of the product whether the product is good or not. I assume less effort was put into the project, which is probably a fair assumption.