Horizon Walker: Suggestion Bug: Max Character Ascention (Workarounds)
Short answer
No confirmed fix yet. Players suggest: A new gacha could adopt your suggestion as a gimmick to draw players in, but it's not likely a pre-existing one would change.
The problem
If you max a character ascension and can no longer improve them, then they should be removed from the drop tables
What players suggest
Nikke's wishlist is the closest system I'm aware of that does anything close to that since removing a Nikke from the wishlist reduces their chance to appear. A new gacha could adopt your suggestion as a gimmick to draw players in, but it's not likely a pre-existing one would change.
I feel like I had this happen on my PC (midline/potato, to be honest) - IIRC, what worked for me was when you are at the loading screen, do NOT click in the circle to load the game when it is ready. Instead, go to the Settings icon in the bottom right corner.
Day One Fixes