Does it matter? The extra overhead of sending a single extra event to the server is negligible...

I'm really confused as to why the nostr:npub1h0uj825jgcr9lzxyp37ehasuenq070707pj63je07n8mkcsg3u0qnsrwx8 folks keep banging on about it. As a dev, would I prefer to implement two entirely different protocols or just one that handles DMs and Groups and can do so in a secure way?!