The edit logs gives you access to something their feed doesn’t: their comments.
If I like what someone has to say in their answers, I’ll follow them: I won’t go to check their comments, I’ll be seeing them live soon enough.
There are three circumstances in which I’ll check someone’s edit log.
- I haven’t heard from someone in a while, and I’m checking if they’re back yet. I’m doing that with someone now. Do come back, Person Whose Identity I’m Not Divulging.
- I’m bored, and I want an extra dose of someone’s Quora goodness.
- I suspect someone is being a troll or malcontent, and I want to make sure. Especially important if someone never answers and only comments. Also handy if the rest of what they say is sensible, so you don’t necessarily dismiss them completely.