Well if you do rework assassins in general and some assassin champions then at least make them less binary. They all do the same snowball and delete people with impunity due to their mobility, and those who don't have excessive healing hi akali or have lots of shielding and tankyness ekko diana. Right now alot of assassins are not in a good spot but give them even a little bit of power and they start blowing up squishies and tanks left and right everywhere making only assasin the viable class to play, remember the assassin meta?
Tanks could use some love too their items got gutted, they themselfes got gutted and their most faced opponents got buffed. This also has an effect on the supports, Who are currently trying to fill the gap of engage tanks and peelers at the same time.
There is just so much stackable armorpen, so you build more health but then there is a ton of %hp magic and true damage floating around making health more useless.
I dont think we will see support diversity untill tanks have been solved, ofc you can gut the current tanky supports but that will make games last alot longer as no team will have engage tools anymore, not that i care but alot of recent changes are pointing in the direction that you want faster shorter games.