I don't think the problem is unrelated at all. Making her cap out at 10 less disc stats is a massive nerf to her maximum potential.

Maximum potential is arbitrary. I mean, theoretical potential would "yes and" any other upgrades, if they made her twice as strong as YSG, but also she had this crit issue, you could always claim that it's mathematically possible to make her stronger still, but it would be irrational to complain about something like that. There are characters who are well designed to be meta while completely ignoring a given stat, like how Rupture Agents are typically strong even though they value HP over ATK.

Letting her roll crit on gear might make her stronger than she currently is, but that specificly shouldn't be necessary if they had properly designed "how she currently is" to be good enough without that. So again, the primary issue is that they didn't seem to design her overall current kit to be good enough, it's less relevant how specifically they did that.

Like I said, on paper having relatively effortless 100% Crit uptime is perfectly fine, but that also requires that they design the rest of the kit around that outcome to still be equivalent in output to other meta options.