So what if you draw less damage? It's not a big deal, just go again next pull.
This is no longer true in the 2 minute meta, which they've already said they're not getting rid of in Dawntrail.

How is it not a valid argument? You're not talking about aesthetics or the rest of the kit. Your complaint is that the RNG makes your damage bad, so playing a job with no RNG is a perfect solution instead of asking for the job with RNG to have none.
I don't dislike StB AST because it had an RNG damage profile lmao. I dislike it because pressing a button with a 4/6 chance to do nothing is not enjoyable to me and I feel like that's a little bit more than just a preference thing? Like... You could replace it with a button that says '30s CD, 33% to do 500 damage' and it would be functionally identical, and I don't think I need to explain why that would be an unfun ability. Even with something like Royal Road allowing you to turn dead cards into different buffs for future cards, that still just becomes part of the gameplan of 'play gacha for the one card you want'...