Endwalker AST and Shadowbringers AST both suffered from a lack of depth in the card system. By level 50, the card system is done and set in stone. At best, you get minor Arcana and Sleeve Draw, but that's just adding more cards and APM, not adding much depth to the system itself. Levels 80 and 90 have the same issue. The cards are more like an afterthought rather than one of the core systems that supports AST gameplay. I think that is what separates Heavensward AST and Stormblood AST the most from Endwalker AST and Shadowbringers AST version. The Dawntrail AST version from the Job Action trailer returns some of the card effects, but it lacks the depth that Heavensward AST and Stormblood AST offers.

Shadowbringers and Endwalker iterations of AST might even have more depth to Dawntrail AST purely due to having RNG and Divination/seal system/Astrodyne in the card system, but those iterations also lack impact. Astrodyne and Dawntrail AST iteration suffers from the same issue - skills lacks effective impact at higher levels for taking up an action slot. For a level 50 skill, Astrodyne and various card effects can be incredibly impactful on upkeeping your MP and getting full value on your defensive and curative card buffs. As AST goes higher in level, the impact of those cards become marginal after getting more alternative healing skills. Likewise, the impact of Astrodyne's MP recovery becomes less valuable because AST no longer relies on GCD healing as heavily, or if at all. The job's design never get updated to reflect the changes into the toolkit. Heavensward AST and Stormblood AST on the other hand make their gauge the entirety of the gameplay focus.

Dawntrail also looks like it removed APM as well since you're no longer redrawing or need to press Draw -> Play -> Draw -> Play as much.

It's good we have different card effects, but it just lacks more substance. Just adding actions to hold a card you don't want used at that point in time (AST Spread), reroll cards, and turn certain cards into AoE will drastically improve the Dawntrail card system by making that the highlight of its gameplay by returning RNG and introducing some depth in the card system, and for some APM differences for players who enjoy a faster APM healer role.