We already had a just as simple a way to discuss those before "problematic" came along, you just said those things were "a problem" or "an issue". The early adopters were just pretentious cunts for whom the intellectual peak of "NPR midwit" was a distant aspiration, who were searching for a way to add a thin veneer of sophistry to their constant complaining, and then in the later adopters there were also heedless followers just copying what everyone else was doing without questioning why we're adding pointless extra letters to an already serviceable word.

To replace disproportionate there is no commonly understood single word alternative, you'd need to say "different to their proportion of the population", which is a hell of a fucking mouthful to go through every time just because some assholes once used it to misrepresent the truth.