I hate the new keystone masterie tree

There's diversity with the current masteries? That's news to me...

Less diversity? As ADC you got 3 different options. AS Assasin you got 4 or 5

There's less options, similar diversity and more impactful strategic choices. Each Keystone is vastly different.

What I dislike about it is, it, feeling like a whole new set of extremely impactful passives that every champion will share. So both tanks on both teams will likely share the same "unique" keystone effect which will simply look ugly and stupid in my opinion in gameplay. I wish they would bring back the Summoner Spell upgrades from Season 3 and design it so that the other Summoner Spells are picked much more often. Flash shouldn't be the staple summoner spell. Buff Ghost in unique ways that it can rival Flash in most scenarios. Clairvoyance and Clarity are 100% redundant. Barrier is barely getting picked up now that Teleport is mid lane meta.

And bring Garrison into Summoner's Rift so it counters tower dives, please Riot.

less options if you are not ADC if you are an adc you can have everything you want