It’s funny, but I tried looking around the old Material Design guidelines and I haven’t come across any mention of swiping to open a drawer. I know it was on Android Developers, but it appears that from the point of view of the design team, it wasn’t really “officially” recommended?
i found this: https://web.archive.org/web/20140110123608/developer.android.com/design/patterns/navigation-drawer.html (alternative link in case archive.org is down) - i presume they removed it from the old spec when they introduced the gesture navigation, so people don't use it because it interferes with the gestures?
wait never mind i misread this paragraph. i presume it wasn't in the design spec as a) it's an interaction behaviour, not a visual design behaviour, and b) it was also a thing in holo design (& older[?]), so they didn't consider it part of the "material design spec"?
Regardless, Discord, IMO, offers a better implementation for side sheets, as the metaphor isn’t that you drag something from beyond the screen into view, you just drag the view itself to the side and that reveals the side sheet. And it works in the middle of the screen so it doesn’t interfere with the system gestures
it's not a bad idea if you're working around gestures, but it means you can't have something where you swipe between tabs when not from the edge, and get the drawer when from the edge

or, for example, swiping to reply/forward in a messaging app, or upvote/downvote on a lemmy client
(also, subjectively, it's kind of a bit ugly)