Its up to the market to discern the earlier date of the original issuance. Its always been this way. The blockchain just allows for easier provenance instead of hearsay.

If you buy a duplicate art piece or an art piece that was "sleepminted" just because a popular artist addresses "dropped it", that's really on you

this sounds more like a UI problem that can be easily solved

try not to get scammed, ripped off, or if you want to buy things with resale value in the future maybe just avoid the entire NFT market and not worry about a UI issue