i think part of the issue is that there's like 10+ years of MAJOR character development for ahsoka that have happened but we haven't seen it and since ahsoka is really dave's baby, he wants to make sure she is getting her due in that sense. she was a general in one of the galaxy's largest theatres AS A CHILD. she was raised by keepers of the peace who had JUST been thrust into military leadership and didn't know what they were doing. the jedi were so afraid of the darkside that they rip children away from their parents so that they couldn't form attachments to them, only to force them into a situation where they form attachments with their masters.
on top of that, ahsoka's training was REALLY screwed up. she was trained by arguably one of the greatest jedi when it comes to force competency and battle skill, but had next to zero time to train in much of anything to do with actually BEING a jedi. she knows how to wave a lightstick around real good, but she wasn't really trained in diplomacy or anything that would qualify as any kind of wisdom trait. then she left the order entirely, forcing her to learn those things on her own. granted she had a better chance of learning on her own than being taught by the order at that point, so it was probably a good call, but to say her training was stunted would be an understatement.
NOW because the jedi teach detachment but then force attachment through master and apprentice relationships, she forms an extremely strong familial bond with anakin who she then finds out is literally space hitler and has NO IDEA how to process that. then skip ahead 10 or so years and here we are. the biggest issue with the show, in my mind, is that it didn't introduce that issue in a fully coherent way. people who are familiar with ahsoka can put those pieces together, and the show did eventually tell us that's what she's been dealing with, but i think it could have and should have significantly changed things prior to where we are right now.
we, the audience, are thinking that the plot is about dealing with thrawn since episode 1, but it's absolutely not. the first half of the season was the audience being shown that ahsoka is broken. she tried to train sabine for some reason, we still don't know why ahsoka is so hellbent on training sabine as a jedi, but it didn't work and ahsoka abandoned sabine. then when circumstance brings them together, she never apologizes for what she did wrong, she just goes back to forcing sabine to be a jedi. she's a bad teacher, she's a bad friend, she's just bad at everything except killing, she's great at that. and that's the aspect that she REALLY has to come to terms with in anakin's final lesson.
they have been talking about thrawn for so long that it forced the audience to look at the show through the lens of "this show is about them finding and stopping thrawn" but it's not. i don't know if they should have just avoided thrawn alltogether, or just avoided thrawn being mentioned so much but i think it's one of the big missteps of the show.