I believe you. But I had the same reaction as mkaziz. And was about to comment on this.
So I think the takeaway is that people are turned off by this - and you can convince people on HN that you won't abuse it. But not everywhere.
And, with a million products attempting to take my time - anything that makes me hesitate (like that I have to allow you to "update my profile") is enough to turn me off.
Ok then why not just ask to post tweets on my behalf? why ask for Update your profile., Read my tweets, etc. Not letting any unknown app update my profile. Sorry.
I thought it might be something like that. Twitter needs to fix this or developers like you will be facing the consequences of their actions. Facebook's permissions are much more granular.