Broken, yes... and not fixable.
I strongly agree with Andrew on his premise, not his solution. Hiring more testers now is not going to fix the problem. Microsoft has clearly demolished the corporate culture that once supported the Windows multi-million-line codebase.
In the 1980s, I visited the MS 'campus' many times. There was an electric hum in the air. A feeling like NASA mission control, of many parts working together in perfect synchronization. Over the past couple of decades, all reports indicate that this culture of precision, responsiveness and attention to detail no longer exists. This kind of collapse is self-reinforcing. MS used to be a Mecca for software geniuses; now it's just a name for ambitious execs to put on their CVs.
A corporate culture is like any fragile ecosystem: once it's lost, it would take a miracle of reverse entropy to ever see it rebuilt.