The contact info in your profile is a gmail address. If google decides to wipe your account and give that username to someone else, do you think it's wrong?
How's it different?
If Twitter reassigns your username to someone else, it sucks for all the reasons described in the blog post, but I find it hard to see potential security issues or the potential for identity theft. Confusion, yes, but hardly anything more serious.
So yes, I would hold Google to a higher standard than I would Twitter.
I suppose also an examination of their respective Terms of Use documents might shed some light on what you can expect and the standards you should hold, as well.