With regards to raid corruptions which are specific corruptions on specific items, I agree that these shouldn’t be removed. I was meaning more for the m+ weekly cache and horrific visions caches, since you can’t get as high ilvl gear from running m+ (which can be uncorrupted) as from the weekly chest (which will always be corrupted unless trinket/azerite). So you’d be forced to use lower ilvl pieces, which still works but undermines the feeling of getting an upgrade.
However, as you say, I do hope that they will make the fix so that we can recorrupt cleansed gear and then this won’t be an issue at all.