That's pretty strong language. I've only had two Apple Watches, both of which were the aluminum variants, and I never saw a scratch on the screen. Because I traded in my first one I can't check for micro scratches now, but I did check those occasionally and never saw any. I've whacked the Watch against walls on occasion - probably only enough times to count on one hand, but it's happened - and there was never an issue.
When the Watch hardware seems to have stabilized a bit more such that I'm confident I'd keep the same Watch for 5+ years I'll go with stainless steel. Otherwise, I have no qualms about continuing to use the aluminum version. No doubt the stainless steel looks much nicer, but most of the time I only see the screen, anyway, and the band is the more prominent item that other people notice.