Landmark, hidden, secret — a classification scheme for information in game situations that might help us better decide what to tell players, and when — https://diyanddragons.blogspot.com/2019/10/landmark-hidden-secret.html
Michael Prescott explains why you probably don’t need to use the OGL, and probably would be unwise to use the DM’s Guild or similar DriveThruRPG programs. “… That last one is so mind-bendingly overreaching that it’s comical. You’re giving them permission to negotiate for you, with themselves. It’s like the devil wrote it.” — http://blog.trilemma.com/2019/10/compatible-with-dungeons-dragons.html
It looks like real-world archery is much harder at range than typical rpg archery. Given that long-range missile fire is hard to make fun, it might be worth trying some harsher range modifiers — https://deltasdnd.blogspot.com/2011/03/basic-d-on-archery.html
Justin Alexander has a good article on why GMs shouldn’t fudge rules and die rolls — https://thealexandrian.net/wordpress/43708/roleplaying-games/gm-dont-list-9-fudging. He doesn’t mention that fudging subtly corrupts you, giving you a sordid aura and making you more likely to do murders, but I presume we all know that by now.
Alexander also has a has a plausible conjecture for why most realm/business/tavern management etc subsystems fail — because they tend to be closed systems, rather than integrating naturally with the main loop of the game — https://twitter.com/hexcrawl/status/1185260871062183936?s=09
Finally, Patrick Stuart has been looking at the OSR-space and has concluded that BX/Moldvay D&D is the common language that makes most of it work — http://falsemachine.blogspot.com/2019/11/the-bx-commons.html. This aligns with my experience — I see reddit and blog posts by people playing OD&D, but they’re rarely the people who are writing things I’m interested in. And I don’t see much about Holmes, Mentzer or AD&D at all.