The reason is simple: seameless updates are out of priority.
Say I'm a developer who contribute to opensource project. I have some spare time and here is decicion moment "what can I do in my spare time?" On one hand there are unsolved bugs and problems users are facing every day on the other improving something that is already works.
As common ...
I think we should keep all three buttons
and it should be Okay | Cancel | Help
it this is a repetitive activity people would most likely wanna hit okay
Help and cancel have less chances hence the above priority should be better
Hope this helps!