I haven't really looked into 1.9, but if your opponent has a shield or special arrows, doing more damage/hit wouldn't be a thing. Plus, Iron Swords do more then all the attacking kits with the exception of 1. Soooo everyone gets miq, or... we put out more kits with shields and shiz. Yay!!
Last I checked none of the kits were click faster potions. Damage, invisibility, healing none of these things are affected by a change in clicking speed for all players....
Everyone doesn't "get" MIQ though... they still have to find/craft the items. Starting with any sort of item gives you an advantage right off the bat. Sure, it's less of one. Still an advantage. Kit wise though... MIQ - sure it gets hit. CC - retains fire, its main perk. PF/EA - protection enchants are nerfed but they still retain other bonuses (Depth/Aqua/Thorns/Etc) Every support kit (Spy, Bfr, Hnt, etc) all remain unchanged. Certain kits are less useful. Most are still pretty useful, and all still give an advantage.
When I said "get miq" I meant it would be the only main attack kit that continued to be super strong because its more damage than a dia sword. Especially since cc's fire is blocked by EA like you said. Anyway, I'll be done playing devil's advocate. I hoped to understand that kits will always be op and sg needs to wither away and die. Or be hide and have us all pretend it didn't exist like @RyanBlocks2 said. I like that plan. Lets do that