In my opinion, items on Roblox that can be sold to other users for currency (T-shirts, shirts, pants, places etc.) should have the comments + thumbs-up/thumbs-down features turned on automatically, and cannot be shut off.
The reason behind this is simple: Scammers. Clothing items (Pants, shirts, and t-shirts) can be sold, and the comments can be shut off. There is no thumbs-up/thumbs-down to clothing items either, so it’s incredibly easy for scammers to scam people out of their hard-earned Robux.
I like where your going with this but allowing comments can be an issue for example spammers.
There is another way to get rid of scammers.
a feature where you “Vote” on if the item is a scam or not and if it gets enough attention ( x amount of votes ) it will notify a moderator and they will be able to moderate it. Now of course in order for you to “Vote” you have to give a reason on why you think it should be removed and the moderators will be able to sort through them and see what is going on. That way you can only vote once and nothing gets spammed.