Potencies can easily be fixed, unlike other issues.
Also MCH isn't all that weak people already managing to parse over 1k on a dummy with it where the BRD's are still not getting beyond like 930.

If there are issues with actual skill kit that's where the worries should lie and MCH kit isn't all that bad as it works together and just needs a few potencies tweaked.
Unlike BRD which had a Gauss Barrel (WM) thrown into their kit which totally doesn't fit the BRD kit.

If you'r quitting over not enough dps due to potency, then I suppose gameplay doesn't matter to you.
Those that quit because of issues with the skill kit I can understand since that's not something which is guaranteed to be changed.