How is sharing a hyperlink more friction than copying and forwarding around an actual document? Personally, I'd always want to share and send a link rather than the document itself.

When my employer set up an online document sharing/review/comment system, everyone eagerly adopted it because the alternatives (like SharePoint or emailed documents) are cumbersome. I think sharing a hyperlink to a web page is about as easy and low-friction as it gets. Anything else is higher friction and requires "downloading" and "opening" with special software on special platforms.

I would be interested to understand the difference in these points of view. Are you perhaps referring to friction doing something else other than plainly viewing or sharing the document? I have not used DocSend.