I had to split this post into two parts because there's a 3000 character limit. I'll append the rest in a response below.
Let me preface this with the following: I have a lot of love for this game. Ever since having picked it up 4 years ago, it's become an integral part of my life, for better or worse. The following I wrote not out of malice or spite, but out of hope for what this game could be.
It is very clear to me that the dev team has little to no idea what they're doing with AST. Anybody who's played since HW/SB could tell you the same: AST has lost most of its identities, both the themes and the gameplay. I'll try to go over as many of them as I can.
AST, the Gambler
When talking about AST changes, this is usually the first one that comes up. Before ShB, the different cards had unique effects with different kinds of buffs. There also existed a tool, Royal Road, that allowed you to burn a card to enhance the next one with an interesting effect. In practice, this was the core mechanic and fun of AST - improvising with the hand you were dealt to help the party through content.
Alas, due to the DPS-focused nature of the game, there was a large complaint about how an AoE Balance, a damage buff for the whole team, was the only desirable option and that the rest of the cards were virtually useless. Without getting into the conversation of whether or not they really were useless in this post, the dev team decided to gut the cards in ShB. They were now all effectively Balances, damage buffs, and created a new ressource to build up an AoE Balance, Divination. This, coupled with Sleeve Draw's changes, guaranteed consistent DPS output in content. Additionally, one could also use the modified Minor Arcana to play a card without generating a ressource, allowing players to more safely manipulate Divination. While this didn't necessarily please veteran AST players, it was understandable to some extent.
Now, in EW, the ressource and core gameplay mechanic was changed once again to not affect Divination, but rather a personal buff called Astrodyne. Besides being the third iteration of AST in 3 expansions, Astrodyne as it exists today has a major flaw: there is no longer any guarantee that you'll collect all the ressource to profit from the full buff. Besides Sleeve Draw not existing anymore, another important way to manipulate RNG was using Minor Arcana to flush unwanted ressources. However, Minor Arcana has now changed as well, and gives a 50/50 probability to get either a DPS spell or a healing one.
These changes combined result in a hilarious outcome, in a cosmic kind of way. Today, DPS output is no longer consistent while still not having any of the interesting manipulation from pre-ShB, essentially meaning that AST, as it exists today, is a class that has been designed for nobody.