Earlier quoted context omitted.
I have absolutely no desire to give anyone else access to my email, and I'd hazard a guess that this is the case for many other users as well. I do want the ability to send mail as another person (I have some 10-odd email accounts), but Gmail already handles that. While this new feature may not be useful for corporate users, that doesn't mean it's not useful for users in general.
I have absolutely no desire to send mail as another person, and I'd hazard a guess that this is the case for many other users as well. I do want the ability so share mail folders with other people, and GMail doesn't handle that. While this new feature may be useful for some users, that doesn't mean it's useful for users in general.
I've personally been using email since 1992, and I've never once used such a feature, nor has anyone asked me to use it. This is despite my having worked on a fair number of very productive teams.
Now I don't know how you personally use it. But I'm fairly sure that if I looked at your desired workflow using it, I could find another that was equally effective that didn't use it. Better yet, my alternative would be much more convenient for any software developers who don't happen to be working in a Windows environment.