I changed my email address in ~200 accounts and only had trouble updating a few: BuiltIn, CPUID, Flickr, Kakao, JCrew, Nord, and Steiger.
After I contacted Kakao support, they asked for some documents. Then they called me to verify the details. A day or two later, they updated my online profile with an editable email field, so I was finally able to update my email address.
When I contacted JCrew chat support, they performed the update immediately and emailed me a temporary password from noreply@demandware.net.
Flickr and Steiger were also happy to help. TBD on the others.
So I can't think of any accounts that don't allow an email change either. But you might have to jump through some hoops.
The Run box is safe, although not useful for multi-line content. That tweet (now deleted) was referring to the Start menu search box.
“You are correct. This traffic was not generated by typing text into the "run box", it was generated by typing text into the "start menu box". We are very sorry for the confusion this has caused.”
I enabled the new rules that support labels and opted into the beta. If you create a new rule that automatically applies a label, you can choose to apply it to "All matching conversations now" or "New matching messages on arrival."
It's the natural next step after software. Imagine the token costs though...
The little GitHub icon on the main page adds some useful context:
>A satirical startup idea generator that combines trending business models with industry verticals (both sourced from the most recent 10 YC batches).