"Diversity"
I don't care if everything else under the sun shows bot; I really don't. You want to play Irelia bot, you can. You want to play yasuo bot, more power to you. You could do both of them before just fine; it was always your prerogative. And yes, they made it easier now which fine, whatever...
I honestly don't care about there being diversity bot lane.
What I do care about is that there is now no diversity in the game as a whole. What I do care about is that I, as a player, have been alienated from the game. What I do care about is that my favorite group of champions is now essentially unplayable anywhere. What I do care about is that unless you can play a bruiser or skirmisher, you're not allowed to play the game. There needs to be some give somewhere to allow not even just ADCs to actually exist in the game but also mages and tanks.
If you're going to make ADC's garbage bot and allow bruisers like Irelia and Yasuo and battle mages like Vlad go botlane instead, then you need to make ADC's viable in another lane, any other lane.
If you're going to nerf mages and push them out of midlane, then you need to make them viable and functional somewhere else; something you half did with Taliyah now playing jungle.
And if you're going to nerf tanks and push them out of both top and jungle, then you should have the decency to make them viable and function somewhere else as well.
Bruisers going bot lane is not "diversity." Its just more homogenation of one role being far too over tuned and now being allowed to take over the entire map. They are allowed to not only go top and Jungle now but mid and ADC, effectively squashing anything else from existing in these lanes. This is the problem with bruisers; they have far too many bits and bobs of other classes to make them ridiculously strong without any of the weaknesses that normally identifies a class.
There are currently no classes that actively work well against bruisers and except other bruisers.
Tanks cannot stand up against their damage with conqueror and thanks this keystone, tanks also now no longer outscale bruisers by getting beefier and having more CC.
Mages can't burst through bruisers who generally get to build tankier items and have in built durability and damage reductions with their kits; they also can't get away from most bruisers who also have mobility and MS also built into their kit making kiting them not an especially grand option.
Assassins struggle with the same issue that mages do; bruisers are usually tankier, making them hard to burst, and they usually have in-built dueling potential in their kit, meaning once an Assassin's CD's are gone, they can easily get 1v1'd.
ADC's scale too slowly, are too immobile, and don't have enough time anymore to widdle down a bruiser before they die. They can't withstand up to bruiser burst and there's only so much their support can do to save them with shield nerfs coming.
There are also bruisers who have the added benefit of being "hypercarries" but only need one item to actually spike and start scaling. There's also the fact that bruisers have one of the biggest build diversities in the game, being able to use not only items specifically designed for them, but also tank, assassin, and ADC items. And, despite people trying to tell you otherwise, they can have one of the cheapest full builds.
And this leads me to my question of, what kind of diversity is it if every role has a skirmisher or bruiser in it? What kind of diversity is it when you have a Darius Top, Xin Jungle, Irelia mid, and an Alistar/Yasuo bot?