Did some more testing on AI Indi and I guess the Absolute squad is alright against bosses with parts. A bit more investment and EunhwaTU would beat Grave's dmg and VestiTU would beat Asuka's dmg there, but considering I could've just placed MiharaOS or Mod there instead of Helm, assuming no healing is needed, then the Grave team would just do more dmg as they get one more DPS instead of a deadweight CDR.
If only the Absolute squad had some CDR you could consider them actually good. This still feels very disappointing from the "strongest Elysion squad" upgrades that require you to invest into all 3 units, like they could've at least let VestiTU's dmg match Alice's on bosses with parts. It would probably be closer with maxed skills, but I doubt she could match Alice.
The team will still be good on the current SR probably and maybe future fire weak SRs, I don't think it's as niche as A2 now, but we'll have to see. Also apparently VestiTU is really good for PvP because her explosion radius hits all Nikkes at once with her shooting 4x and activating her S2 skill dmg as well she can just shred teams and being fire she has ele advantage against popular defensive units like Noah or Blanc, so at least investing into her can be worth for something else too.