I think I see what he's saying.<p>In some places, there's a gap between open-source libraries that I can find, and services that Do One Thing.<p>Recently, I dived into the available options for online document signing.<p>I needed one thing (document signing) done well, with a few variations based on the few different integration situations I had.<p>Almost everyone had the same offering, which wasn't programmatic or flexible, but <i>was</i> drop-in (iframes). I could only do what they'd though to make possible.<p>On the other hand, I have trouble imaging what, say, a ruby gem for this would look like. Seems like it'd be pretty involved.<p>Compare this to, say, SendGrid, and other email providers. I get a lot of flexible functionality around one thing (sending emails), but the interaction is very much on my terms (via their API) rather than theirs (dropping in an iframe).<p>The only exception I found in the document signing world was HelloSign, which has a lot more in common with SendGrid than, say, DocuSign or RightSignature.<p>I don't think this is quite what he's talking about, but I do think it's indicative of the direction and forces in play.