I think a big part of why remote learning is such a "tough nut to crack" is because in-person learning is about the social experience as much as anything else.

As much as I've enjoyed online courses that I've taken, even the ones with robust Discord channels haven't felt the same as in-person courses. At least in my experience, so much learning is done outside of the classroom in study groups, talking to teachers/professors, and even in casual conversations with other students. While some of that can be facilitated with technology and appropriate structure, it simply doesn't have the same effect as putting all those people in the same physical space.

There's also the cost aspect: CS50x and Nand2Tetris are among the best courses I have taken, including the in-person classes I took for my Bachelor's. However,I don't think I'd be nearly as satisfied if I'd paid university tuition for either. I've taken a few community college courses remotely during the pandemic, and after experiencing high-quality MOOCs, it's hard to avoid the feeling that I'm basically paying a hefty premium for the credential.