The question is - why is the quality so bad? Isn't the process supposed to catch bad quality?
Their process is consider the windows insider group (extreme power users) to be a good enough replacement for proper QE teams, and writing automated build tests.
Right, the new process isn't to catch bad things, it's actually to see bad things as "not all that bad." Presumably because a shift from viewing their products as being for business to being for entertainment. Remember when Windows 95 was a key tool for businesses, but by Windows 98 they had made sure to put a "for entertainment purposes only" label on the product to make sure no one confused it with something that was intended for business use?
I feel like that's where they are now. At least internally, no one is really thinking of this as a business tool.