I appreciate all that Gavin Norman and Necrotic Gnome have done for the OSR TTRPG scene over the past few years, but I have to say each time I see a D&D-derivative system it makes me wish that other systems of the time—like Runequest, Tunnels & Trolls, or West End Games' d6 system beneath Ghostbusters (1985) and Star Wars (1987)—got even half the attention. Tom Moldvay and Dave Cook's Basic/Expert (1981) has been don…
I do not know where on the crunch spectrum the systems you mentioned fall,