My main issue with alphi before and same with minfilia is they existed only to move the plot along and did absolutely nothing interesting or worthwhile besides that. Minfilia got written off because of that eventually and they decided to make alphinaud into an actual story character which is nice. He's pretty good now to be honest, we get a lot of "lol let's do politics" which is fine but points to him actually doing things rather than "pls come here lul crystal braves, save me halp". Alisaie is kind of going through the same thing now, she was the real do nothing during stormblood (not lyse) and had her failing bit at the end so we will see how it goes. To people pointing to do coil for alisaie and such, it didn't go anywhere because they didn't want to tie the raid into the msq or character development so unfortunately it's fun but doesn't really do a lot for them as characters. You get some neat info and backstory but doesn't improve the twins at all imo.