TomResing - yeah, we are using modern list/libraries (not too much on modern pages yet--branding, customization and content formatting limitations🙁). Our users are still having some confusion (somewhat like David Doig's comments above) going back and forth between modern/classic for certain features but gradually getting people sold on advantages of modern. But, yeah, it is good that we can at least take advantage of some modern features on classic sites. Still doesn't change my thoughts on my comments above, but my frustration would be all the more if we couldn't even use modern list/library/pages on classic sites. I was surprised to see Bob German's comment that modern pages weren't yet available on classic publishing sites. I thought we had done that but I guess the only places we had tried were classic team sites.
Somewhat tangential but still related to modern features, has anyone seen the Compact List view (reducing padding/margins) on Modern list views in your tenant? I thought that was supposed to have rolled out in September but still don't see it in our tenant.