The only reason they don't is greed not that they can't as seen with the vindicator box before that went indefinitely until it was pulled. They want you to ideally whale on every gacha regardless of the quality of the outfits and having a universal ticket would reduce sales cuz you can just hoard on the gachas with better prizes.
The over emphasis on add damage over actual skill
the ridiculous jump in power of +16 and above
the even more unfair enhance rates
one shotting early s1 zones (general dumbing down of content)
The qol was nice tho