The base expectations for classes REQUIRE tanks to be unsatisfying to play

Marksmen: Do nothing (mostly) but ranged dps, need to position far from enemy carries, can often only hit tanks - they absolutely have to be able to shred tanks or they're pretty much unplayable when they're tuned right (which they aren't right now).

Skirmishers: Squishy melee dps champions. Specifically designed with the intention of being able to melt any class, basically unplayable if they can't shred through tanks quickly because against coordinates play tanks are all they can hit.

Juggernauts: Low mobility sustained burst, have no way past he frontline, are designed around the assumption that they can burst through durability.l, otherwise they are useless. Their fucking core item as a class makes tanks less tanky

DPS Mages: this isn't really a unified class under riot's terms, but champs like Cass and Karthus and Zyra are designed to have mediocre to poor backline access, no defensive tools, and backloaded damage, which means, once again, they have to be able to melt through tanks to be playable. They were actually so overtuned against tanks that riot gave tanks an item specifically to counter them (instead of just returning the interaction, because riot) but then made it garbage (again: because riot).

That right there is four classes which BY DESIGN, without anything else, as just part of the fundamental assumptions integral to their design, HAVE to do be able to kill tanks quickly, when the whole point of playing a tank is that you want to live for a long time.

That's not counting divers, which also love black cleaver, for some reason often get attack-speed steroids and heavy repeating damage and have to by their nature be durable enough to ignore a tank's damage, burst mages which can't easily kill a tank on their own but can heavily chunk them, and supports whose need to be effective enough to protect their adcs from skirmishers and divers, and therefore just sort of automatically remove the possibility of an adc ever being affected by a tank in any way whatsoever in the late game.

Seeing as riot has decided that tanks should never be able to duel or waveclear, eliminating them from the toplane, and that they shouldn't have meaningfully clearapeeda or jungle sustain (except Zac and Sejuani) making the jungle feel like shit for them, I'm at a loss as to when Riot wants tanks to feel like they're actually doing something.

And no, band-aid fixes like really don't cut it.