This would preserve the past accurate feedback
But with all this, it would mean the DT system would need an overhaul, and I don't think we are all ready for the drama that ensures afterward.
What past valid feedbacks? In case you and any other member here have your heads in to the sands, let me shout out so you can hear, how many of scammers, cheaters get exposed/doxxed after getting caught? Have you wondered why they never stop popping up like mushrooms the more you catch them? You can't fight them like this, instead you have to educate the community in a way that they become vigilant and informed enough, not to fall for the scam.
Instead, you are actively trying to stop something that can easily be gamed. There are many farming services/ shilling services providing you with enough "bounty cheaters" "scammers" with low fees so that you could continuously catch them and tag them, then you'd become a useful member to get on DT. Once you are there, we'd have this current situation, you can easily spend $10,000 to become a reputable member with hundreds of "good" feedbacks.
Note, the price is much much lower than $10k, I give them credit by saying $10k, you could get positive trust by trading $1000 back and forth with a few old gang members.
Anyways I wouldn't trust anonymous individuals with money, no matter what, unless they reveal their ID for the public.
Edit, separated paragraphs to make it clear I'm not directly talking with Bitcoin_Arena, rather saying things in general. Lol