I don't really see how that's annoying, just set it to hidden or whatever. I believe this rule was added (and has existed for like forever) because the moderation team is not able to judge an appeal on its validity as the evidence cannot be reviewed anymore. On top of that it's mentioned within the reporting rules so I don't see why you're complaining.The annoying thing is I reported some one 3 days ago for scaffolding and he got banned. I deleted the evidence yesterday because I don’t want random videos in my YouTube channel then I got a warning saying I can’t delete evidence that are under 30 days and the hacker got unbanned, lucky him.
You're causing trouble for the moderation team, hence is why the punishment was removed and your reporting account may be 'trapped'.