GAC hasn't been updated in over 3 years. It's not a priority for them, they are only focused on releasing new shinies. Their only concern with PVP is omicrons and datacrons for us to buy/rent.
CG is trying to be like Raid Shadow Legends and get us up over 800 characters while ignoring the rest of the game. "Oh but we gave you a new raid that we didn't put much effort into!" "Oh but we did an assault battle that was broken on release, just like everything else!" Yeah, sure. It's a push to get us to relic up characters, so it's a FOMO tactic.
CG is releasing more bugs than they're fixing and can't keep up with the bugs, the old events, and player concerns. So they just ignore or low priority everything else but new shinies.