I would think that the complaints on those forums would not be a significant sample size of total F150’s that have 5.0l’s, therefore, not really a reliable source of how “common” the failures really are. I would be willing to bet that a far greater number have pumps that surpass that magic 100k number by quite a bit.
Reading about “common” failures and problems on a platform where people go to complain or seek advice about a problem can lead you down a rabbit hole. There’s not too many forum posts that consist of people just starting a thread that says, “My car has never had a problem in 200k miles.”
According to the internet, I should have yanked my cam and lifters a long time ago.