>does not change any abuse scenarios It absolutely does. When the scanning is server-side, companies can only scan the files you choose to send to their server

>does not change any abuse scenarios It absolutely does. When the scanning is server-side, companies can only scan the files you choose to send to their servers but with a client-side system in place, all it takes is a change in company policy and a few simple directory config changes to result in ANY file on your device being scanned. Slippery slope or not, the client-side system massively lowers the bar for abuse and that cannot be ignored.