I agree on the limited options part, mostly for Brown/Red still needing an all-cleanse troop.
But i would be good with that, an all-cleanse for every colour is all i really need, but the more the merrier i guess.
Disagree on the cost part, i find ~2 mana for an all-cleanse fine really.
Aside from GS summon, All-cleanse is the most beneficial secondary effect on universal transformer troops in my opinion.
I really like that idea of passive counters that don’t render the status effect themselves useless.