Do you know that, it is it just speculation? I could speculate that there were technical reasons around having two smb patchsets to test in various combinations vs bundling into one.
If 'trying harder' is not possible due to financial reasons, then the only recourse is disclosure.
This bug will be fixed now, but certainly could have been excluded again because of technical reasons---they're publishing a separate set of patches on SMB again soon, maybe those patches have higher priority to people on the Microsoft org-chart than the patches for this bug.
When companies aren't given hard deadlines for disclosure, they'll just delay forever because there is always a technical reason that you can't do enough testing to satisfy yourself, while doing X, Y, Z which are added to your schedule for political/financial reasons.
Further, so what? There's always some problem. They should either suck it up and work harder or come clean and give users actual choice in how to respond.
I didn't say they do. I responding to the parent post on the bit I quoted ("They chose..."). If it's irrelevant under other precondition, take it up with the parent post.