Coming at this as a marketer (not engineer), with a human psychology perspective:
Sometimes dialing in parameters isn't a homework assignment, it's an expression of love.
Ok, I admit, I'm being dramatic.
But let's look at coffee.
For people who like coffee, engineers have designed a product (Keurig/Nespresso) with a bunch of best-average-assumptions, nothing to tune (except at the store: choosing your favorite flavor), press one button and go.
But for people who love coffee, they immerse themselves in arduous rituals, tuning everything, from obsessing over which grinder to buy, which granularity to adjust to, what temperature to heat the water, etc., etc., with some folks even roasting their own beans. We tend to show love (devotion) through what evolutionists call "expensive behaviours". That includes buying callipers and adjusting fins, even when we shouldn't.
@Than_Bogan I get it, the engineer — like a good writer/editor — should keep carving away getting down to the fewest adjustable parameters that can make the most meaningful difference. If the fewest parameters = zero, that's a good day for an engineer (what did Einstein say? something like "Make it as simple as possible, but no simpler"). But for the kind of folks that join a forum to spend all winter talking about slalom technique (and fin settings): well, forgive them, they're in love.