BJJ really is just Judo (I say this as a BJJ brown belt who started BJJ before Judo) that evolved down a different path and from early students (the infamous Gracies) that never seemed to have learned the standup portion of Judo well, honestly.
In reality, I consider them two sides of the same coin. BJJ really is just Judo (I say this as a BJJ brown belt who started BJJ before Judo) that evolved down a different path and from early students (the infamous Gracies) that never seemed to have learned the standup portion of Judo well, honestly. Therefore the rules they made did not reward that part of the art, therefore those techniques weren't passed down deeply.