The shield buff was a step in the right direction for shield builds, it has definitely given them an alternative to the 5 year old max mag stacking build. But it hasn't fixed the defensive issues the class has in pvp and only really reinforces the notion of build a high health tank or a squishy dd.
The class's heals have not kept up with the damage and speed of the modern game and no amount of buffs to shields outside of ridiculously broken changes will fix this because the flaws with the class's healing is not tied to numerical values, it's tied to the functionality of the skills themselves.
The class still relies on dealing critical damage to get healing over time while lacking proper access to basic crit chance and crit damage modifiers. This is elaborated on in the next spoiler tab.

This was touched on in the healing spoiler tab, but most notably the class relies heavily on dealing critical damage to proc their heal over time to have enough passive healing to keep up with the current game, but the class lacks any inherent access to major prophecy/savagery and crit damage buffs that would help make this more synergistic and reliable which is what passive healing over time needs to be.
The class still lacks many buffs/debuffs, even common ones such as breach and the afore mentioned prophecy/savagery, it is also tied for the lowest amount of named buff access in the game, with multiple of its buffs being tied to abilities that are unusable if you want to do more than overland questing/roleplaying.

This is not a direct nerf or buff to sorc, but reworking mist form to essentially be a better Ball of Lightning skill that every class can use was not good for sorcs already fast fading class identity as the fast paced mobile damage dealer. While I do actually like what they did with mist form, it removes the last unique thing sorcs had in this game and gives it to every single class to stack alongside those other class's already superior defensive capabilities.

There's actually 2 really simple fixes for the class.
1. Give the class a proper burst heal, the same as every other class in the game. Either rework dark exchange and morphs or make 1 of the shield morphs into a heal instead if people are worried about shields + healing being too strong.
2. Give the class access to more buffs/debuffs. Notably, crit modifiers to help tie crit surge better into the class kit. Add these to passives or to abilities that are worth slotting, there are far to many abilities in the class kit that aren't worth using that only giving a needed buff to them would not help them get onto a bar with the limited bar space that class already has.
3. With every class having access to essentially a better BoL, make sorcs offensive kit a bit more reliable to give them their niche as a strong ranged dd back. Faster travel time on frags and overload would help a lot with this. No damage increase, just faster travel time to give less time to roll dodge these projectiles.

Note: For years now, everyone has been crying about streak as the main reason for sorcs to not get a reliable burst heal, or have their abilities be made more reliable in general or even give them more/better buff/debuff access, well now that every class essentially has access to BoL, it should only be fair that sorc finally gets access to what every other class already has, a reliable burst heal that only takes up 1 bar slot, cannot be killed, scales with damage and has no cast time or delay.