overgeeked
Cheers to the Tin Man
Because it’s the earliest and easiest version of the Basic game with by far the most sales. It’s the most widespread of the rules light versions of D&D. More people started with it than the other Basic editions. So, nostalgia. When the OSR came around B/X was out of print and not available as a PDF, so OSE. There’s also momentum. Like 5E, everyone’s playing it so everyone plays it.Full disclosure: I legitimately do not understand why OSE is a thing. It's just B/X. Why is THAT the one that a significant portion of the OSR locked on to?