Haha. You're correct, Microsoft do still test. However, they dropped tons of testing resources years ago.Even though Microsoft makes use of the Insider Program, they still have a QA Department, and there are builds being tested internally that Insiders never get to see.
The home users are the testers now and they will feel the wrath of Microsoft as borked updates are released. All because Microsoft dropped testing resources. They chopped it off like rope and are left with not even half of the rope.
If Microsoft eliminated QA completely then there would never be a single successful update. They have to check that things work for them. Then it gets thrown out there in cycles (like a cancerous supply drop).
If the AV with millions of customers or other software that you use is incompatible with that new update and the software vendor doesn't magically fix it after testing with a Windows Insider build? Have some toast once your Windows machine gets the update officially.
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