(Sorry for long response in advance)
Two biggest ones for me would be variety and a wheel. There’s still the second and third drops coming, but atleast the program can be completed before these. Last year the gatekeeping until later drops was annoying so atleast that’s an improvement.
For variety I liked that the first two events wins would progress, but maybe a win shouldn’t have been as rewarding since it was one of the fastest MP programs to finish. I did like that there were multiple paths to completion, so you didn’t have to do every single mission. Having event programs/cards is great, just will have to see what today brings for Jackie Robinson Day. Really just annoyed about the Ks, but pretty sure that’s most people.
As far as a wheel, I’m sure SDS is scared of balancing that and people abusing it. But that’s why it can be an iterative process. Stick rewind packs in those, Deluxe Choice Packs, Saint Patrick’s Day and the Choice WBC pack with Ohtani/Judge or packs that didn’t have collections with them.
Missed opportunity to have the LCS cards again (Webb and Rosario) along with WS cards, since we don’t have BR cards. I get it was WBC, but as someone who has never reached top ranks that was a goal I set for myself. Got close, but fell short. I never played against any of those cards, but did buy Webb for myself since I typically enjoy his cards.