Morgana is not strong enough to warrant these nerfs, she is a midlaner and there is no hope for her to hold her own against the likes of Yasuo, Akali, and Katarinas to name a few after this nerf, and after any of the subsequent nerfs Riot has planned for her abilities and damage. This legitimately makes me so sad, it's like Riot does a wonderful visual rework and then completely annihilates my favourite champion.
She supposedly has a 53% winrate (most likely in midlane compared to a 51% winrate as supp against champions that better deal with her limited support kit) this is only 3% greater than 50%. So Morgana at least loses 47% of her games, and wins 53% of them. I strongly disagree with the idea that Morgana counters almost all support champions that's just false. There are multiple strategies and methods of dealing with her kit. She has a shield that can temporarily prevent hooks, however the cooldown of those hooks is lower than her shield, and so it's not an unrealistic defence, plus as a support you can only defend one person out of 2. She has a root for her Q which is actually easily dodged or avoided by staying behind minion waves, it's nothing like Lux's q which can go through 2 minions, and Neeko's which can go through multiple minions, as a morgana player I personally struggle against tanks like Alistair, Galio, and Blitzcrank because even if I hit my CC I do negligible damage to their health and neither can an adc in pursuit of the kill, nefing Morgana's damage will only ruin her in support situations, and completely ruin her midlane.
The assumption that ban rate equates to strength is false, just because many people ban a champion doesn't mean that they are very strong, it could just be because the majority of casual players do not want to deal with Morgana's CC, and AOE W and she was created as a midlaner so her abilities naturally do damage, but compared to other champions Morgana does a comparatively small amount of damage, like for example Brand's full combo.
This Nerf is ridiculous, and completely ruins Morgana's viability as a midlaner, and as a desirable support. There are supports such as Sona with higher win rates, and it's not like she's being nerfed into the ground. I unfortunately may stop playing the game after this.