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(edit: almost) everything can be found on sci hub.

Not everything. A lot. But stuff published this year still hasn't made its way there. And not all social sciences.

source: dissertating

(When I need something I can't get through my library, #icanhazpdf, find on scihub, or other googley means; I just email the author. Though that can take some time.)

In my experience, the only hole in shadow libraries is that they lack scans of old papers on non-trendy subjects. Interestingly, it seems the humanities don't have analogously useful sites.

What if you needed to link to a paper on your company's website? You'd link to sci-hub?

I think you are overestimating how available high-quality information. Low quality, misinformation, disinformation - that is all widely available.