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I believe it's a case of if the information is inaccurate or if it is not a YMMV trope (say Even Evil Has Standards is used incorrectly in citing a YMMV trope when it is shown in universe) then go for your life. For something like Complete Monster, we actually have special rules regarding the use of this trope. As for something like Crowning Moment Of Funny, these are subjective. I personally thought a recent Angel & Faith comic was the best thing ever yet some might groan about it featuring Harmony, so it might be best to leave those.
Currently reading up My Rule Fu Is Stronger Than Yours
I have been wondering what the policy is on editing a YMMV entry not your own? What I mean is that recently I have found many entries in certain YMMV tabs which are just ever so slightly not accurate/reflective of canon, as well as often making the entry not applicable in the tab once the correct information is provided, but because it is YMMV entry I'm not sure what the protocol on this is and I don't want to offend anyone, start a conversation correcting them, or create an edit war. I'm sorry if this has been answered before, I'm a long time reader but a new contributor.