It seems to me like "books are slower to produce than online material, so they're higher quality" would belong to the class of statements that are true on average but close to meaningless in practice. There's enormous variance in the quality of both digital and printed texts, and whether you absorb more good or bad material depends more on which digital/print sources you seek out than on whether you prefer digital or print sources overall.
Agree completely. While most of what's on the internet is low-quality, it's easy to find the domains of reliably high-quality thought. I've long felt that I get more intellectual stimulation from a day of reading blogs than I've gotten from a lifetime of reading printed periodicals.
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