I'm not really sure. Steemit is what we make of it. Currently, I'm not seeing many signature blocks in comments, though some are doing it and it is possibly an effective way to get noticed. For me, personally, I usually just click the user name and head over to the blog and check it out that way. No link in the content needed.

Maybe that'll change over time. Maybe, like many forums, signatures will be included by default. Or maybe that could be implemented on chainbb and people who like it could use that interface.