Gauntlet is osrs related lol and this is a Rsps it doesn't have to be 100% accurate pretty sure 250× xp rates ain't in osrs but they are here.. and in your opinion maybe but it's more fun knowing if you have received a unique like the cox purple chest or tob chest
the "not in osrs" part was to the coloring of the chest after completing a run, not gauntlet itself... obviously xp rates are buffed on a rsps, but content released on here still tries to be in line with OSRS as much as possible.
Sure that's my opinion but you thinking itd be 'fun' is also just an opinion, which can differ which is why I don't support this, I feel like it'd be a waste of dev time to fix something that isn't broken.