All Jobs
Abilities that rely on dealing damage to absorb HP do not restore more than 1 HP if the target is shielded. If it is intended for these abilities to drain health even from shielded targets, please fix this interaction.
e.g. Drain's "Absorbs 200% of damage dealt as HP" effect.

Revamp common actions to allow for more variety.
Revamp additional actions to achieve the same goal.
The playerbase feels like there are too many underperforming additional actions that create an environment where there is only one or two correct choices with any given Role. Diversifying, revamping and/or bringing up underperforming additionals AND common abilities would help bring more decision-making and depth to the system and giving players more tools to deal with a variety of situations.
e.g. Rampart should be a common ability shared by all tanks, therefore moved from additionals into their base toolkit, and possibly adding more additionals, to allow more choice in how players can and want to handle different situations.