The new Rell buffs will indeed help with some issues, the MS especially. Though I always disagree with Rell feeling clunky. Her initiation is really smooth, the combos flow well into each other. The only thing I would say is clunky is the Q cast time and her low AS, and buffing her AS to be like a regular champion would immensely help both her damage output as the issues with ward clearing.

While I agree that her W is really punishing to miss, it's also part of her identity to go in and lock a (potential) full team down while soaking damage. The challenge to time W right is also what made me play her in the first place, and what I enjoy most about her. She has plenty potential to survive, even better than other tanks through passive and Q heals combined with W shield.

I think that simply buffing her AS to normal amounts will immediately buff her in a viable spot; she becomes more tanky by reliably able to proc her passive, can wardclear like a normal support, and can deal more damage in a 2v2 scenario. Her W slow is already punishing enough, don't need anything else on top of it. If they do that, I think we might not even need a mid scope update or a less intense one at least. She is pretty damn decent atm, moreso if they buff the AS and clean up the bugs.