[tedunangst]

If you're trying to change your lifestyle, it's more difficult when you have a bad friend constantly enabling the behavior you're trying to cease.

Google may not have a responsibility to be a good friend, but personally I'd prefer not to have a bad friend always following me around, thus I'm a little less excited about this feature.

[whonut]

You can just tell it to stop. It's not hard.

[kodablah]

I think many would rather tell it when to start instead. What's hard about telling it to stop is when you can't tell it's started because it's something more nuanced than the obvious diet plan.