SMN has always been good. Even in ARR it would outpace BLM depending on the fight. I'm happy they're nerfing Radiant Shield's damage, since it was hard to gauge how good it was without FF Logs, and the damage nerf is needed. However, I'm still not happy with how SMN is in terms of flow and design. Since the beginning of Stormblood I've been mad about how they've approached SMN in general.
I still want the Aetherflow lockouts removed, and for Bahamut to only trigger on spells. Summon: Bahamut should have been integrated into DWT and thus trigger every three minutes instead of every second as a result. Make Enkindle into Enkindle Bahamut when Bahamut is out too and reduce it's CD to 60s instead of that god awful trait tied to the Ruin IV proc.
Tri-disaster should've never gotten a reset. Imo Contagion/Radiant Shield's Phys/Magic Vul Up debuffs should be applied by this instead. With Bahamut giving a general Vul Up. Remove Ruination entirely, and make the pet skills deal damage.
Bane is nowhere near as good as it used to be and I'd rather see it's minimum damage cap at 40% instead of 20% in exchange for removing the Tri-Bind buff. It honestly felt like they bugged the skill out in HW.
They need a different form of filler to make up for all of this, obviously. So remove the Ruin IV procs. Just make Ruin IV and Ruin III available through DWT, and a reliable resource/proc otherwise. Hell, making pet abilities (not the auto-spells) trigger the proc guaranteed would be good enough. Or DWT charges up the resource and you can spend it where you want outside of it. Either way, they need something unique to break up the constant Ruin III spam. That's what their DoTs did in ARR and HW, even with old contagion.
Obviously none of that's gonna happen till 5.0, but it's still on my wishlist.
As for RDM, I hope they get some harder hitting mana spenders in their spell rotation for 5.0 as well as a lower cooldown on Manafication, to make it better to juggle your mana around 40-50 while waiting till it's up. Verblizzard/water would be obvious contenders for that. That, an MP Restore/damage oGCD in the form of Osmose, and maybe Scatter II to improve their AoE, would pretty much fix every issue with an ability/trait to spare.