How is pull-requests in github different from e.g. tasks in gmail? If you use the gmail task feature, I believe you are unable to access it via IMAP or from you

How is pull-requests in github different from e.g. tasks in gmail? If you use the gmail task feature, I believe you are unable to access it via IMAP or from your mail client either. Or perhaps the filter options in gmail too? (can you sync these easily with procmail?). I don't use it much, but some of the google-plus integration might also go beyond simple email... I think there must be other examples of unique features that gmail offers over email. That being said, if I continue to look at the email as an analogy, look at what's happening with facebook. They removed the subject line, gave people facebook.com address, built their own messenger app, all seems to work quite well, with many of my friends stopping to use email and rely solely on facebook messages. Sure, it sends you an email, but effectively obscures your email address from your friends... I think this is worrying, and I can understand at least some of the sentiment of the author about github implementing a feature that people like, use and depend on, but one that is essentially incompatible or draws away from git.