> It wasn’t practical to convey knowledge in a short form previously because printing and distributing a blog post worth of info was too expensive.

I don’t think this is true, people have been printing newspapers, pamphlets, and leaflets for hundreds of years.

It isn’t only long form content that the printing press was good for, It’s just that the long term content tends to be remembered longer. Probably because it isn’t just long for the sake of being long :p