Um, yes you can.
People argued no changes because Classic as it was was better than it would be with the changes people were suggesting (or in some cases the “improvements” being advocated were sufficiently consensus that them being better was not clear, so default to no changes).
Cataclysm was, by popular consensus, kind of shit. If changes would improve it then ipso facto changes should be advocated for.
There’s no inconsistency there.