I don't care much if AST has RNG or not, it's not what makes or breaks the job for me. I have to say I like 'true' RNG though, that is the one that only has two outcomes: good or bad. I like EW Minor Arcana because you never know what you will get but you always know what you want and you can't do anything about it. Most of the time you want Lord, but sometimes Lady can be useful in messy runs. If I get what I want, yay. If I don't, better luck next time. It's a good button to press in my opinion, even when I lose the RNG game.
I'm not a big fan of the 'main' cards, though, because it's 'false' RNG where the outcomes are 'good' and 'less good but still good'. It feels like I win every time and it's not very fun. You can only truly lose with Astrodyne if you don't get 3 seals, but Astrodyne is weak on purpose so it doesn't matter because you don't feel the difference. A system like this might as well not be there in my opinion.
If I had to choose, I'd take cards with different effects over RNG because that's more important to me and most importantly, more fun. Unless it has 'true' RNG, but most people don't really want a true gambler class where you can effectively lose.
I want more unique effects though, and not just something as simple as '500p heal on target' (luckily, no card is a direct heal). Even a mitigation buff can be interesting if it grows stronger over time so you have to play it well in advance and time it right, for example. Cards could have different effects based on the role you use them on and they could also add secondary effects to some of your skill (like Nocturnal sect used to do).
Lastly, we should have ways to interact with our cards, because they should be AST's main mechanic and not just a minigame on the side which often feels like pointless busywork. We should be able to undraw a card we have no use for so we can buff another card; we should be able to extend the effect to the whole party; we should be able to extend the duration of the effect. In other words, we should have old tools back that would synergize pretty well with the new system, like Royal Road, Spread and Time Dilation.
I'm curious to have tooltips, but regardless of what cards effectively do, we should get tools to interact with them in more meaningful ways.