And after you've "fixed" this "problem" for the current state of the app, you happily leave, and the next person is tasked with adding new features, and suddenly they find the app incredibly rigid and impossible to modify, so they add some abstractions like factories, delegates, etc...

I mean, anecdotes. I find it funny that in a profession allegedly heavily influenced by science, we keep trading anecdotes(in my experience, "more often than not", etc) instead of having any hard data, tests and experiments to compare.