I don't mind the new version... 

But, I admittedly don't use them for anything except an instant alert an item has sold and to get a rough sense of how many items I have to go pick and pack (I disabled notifications on my phone, 'cause they're annoying  ). 

The green symbol differentiates them immediately by sight, so I can tick them all and mass delete without the risk of deleting other eBay emails I should read, or need to keep (I've done that before with notifications someone was paying by bank deposit, which these days happens so rarely I'm always a little surprised when someone uses it).

If I need to find past transactions, I just search the PayPal notifications, since I keep those, and each item number is on the receipt, so I can search my email by keywords, user name, actual name, delivery address, or item number, and get the results I need (the PP receipts also contain a direct link to both the PP transaction, and the eBay listing, so for me they contain [almost] everything, when buyers pay that way).