Bugs will be fixed. But this thread sounds a lot like Meteorite Farmers complaining they are having trouble soloing it with ther 11 alts to max the 25 fragments quota per run.
Beginners can still do 15* with simple coordination(this will be even easier when fixed), all it needs is understanding the timings to DPS with Max Pain nullifiers(Dark Claw, Pneuma, Empty Shadow) or even waiting and not attacking. Heck, our group even wiped with max pain once and was able to complete the instance with tokens without resetting Betel.
We don't have a lot of party content rn, now that we have, people want to make it absurdly easy to solo it again.
Betel has HUGE hard counters if you understand how to build your character. It is not that scary. Its a good idea to learn ur modifiers.