Why is there a lot of fans who really, really miss the Battle Frontier? I'm all for shitting on Gamefreak for removing good things, but if you want to battle using competitive rulesets you can just battle online. A couple of facilities were genuinely interesting (mainly the Pyramid and Pike since they weren't just endless battles) but it's not a feature that makes sense to include in the age of online battling. Why's it treated as such a GOAT feature?

Is it just nostalgia?