You don’t see them because, IMO it’s the arm chair quarterbacks. The “I would have” “You should have” and my favorite, “That cam sucks, you fucked up, I bet that’s a slug out of the hole until *** rpm.”
Oh! And coupled with the “Mathematician” know it all’s that insult in a way without being direct. The other half of the bunch don’t even realize what they’re saying and they’re telling you how stupid you are. That also applies for every other part of the engine & car build.
No one really wants to hear someone else’s opinion and **** when it’s not asked for.