You might be right. The developers could use their time better working on other features. I just know for me, I have stopped using ThinkingRock after being a complete fanboy because the integration with email was not close enough. At the time, I was receiving 60+ emails a day, about 20-30 of them requiring between 15 and 60mins of work each. The adding them to TR just to be closed off again the same day didn't seem time effective, given how many clicks were involved from the gmail interface. Worst thing I found was that after an email was added to TR as a task, going back and trying to find that email again wasn't simple, so I was hoping that by tagging it, locating it would be easier.
So that's to say that tracking emails through TR wasn't working for me. Slowly over time, you just start leaving more and more email in the inbox thinking that it's a quick 15min task that can be done. Then slowly overtime you lose that zero-inbox.
I feel that TR is an amazing tool still, but was just too isolated from my day to days.
M