Revert Rumble's E Change
Rumble has one of the lowest play rates in the game and can be very complex, so I don't blame Riot for accidently nerfing him. I feel like they wanted to buff him with the E change, but it actually reduces his effectiveness and I want to fully explain why.
Initially it might look like a buff because he can now has more opportunities to cast his E, but the slow got nerfed and Riot made the second shot cost heat which really fcks him in ways that aren't always immediately clear.
Rumble used to start cooling off after the first E cast because it was the only shot that generated heat. Now that the second cast also generates heat, he has to wait that much longer before casting his other abilties. This effectively increases the cool down of all his other abilities by the length he waits in between E shots because otherwise he will generate too much heat and silence himself. As a result his win rate actually went down.
Trust me... as a Rumble main the E change really messes up his heat management, and the charge system is just one more annoying thing to keep track of while trying to manage your heat. Sure, it might be easier to CS in lane... but it makes fighting actual players much more difficult.
Please revert the E change. The early game buff to his shield was a much better idea. Maybe make his shield scale with health or something like an actual bruiser. God knows he needs it right now... top lane Rumble almost has the worst win rate in the entire game (roughly 43%) according to Champion.gg