I'm not myopic enough to see it as MS lying to me. Software development is normally conducted by teams. The software team that did this either screwed up and failed on the notification part of the code, or the testers failed to write a correct test case, or any number of other explanations short of being a simpleton and calling them liars.
If something doesn't work right, report the bug, don't cry that you were lied too. If MS doesn't patch your bug, there is a chance that the patch would be overcome by other changes and make it a wasted effort, it's a company's product and they never claimed it would be perfect for everyone always. If it doesn't work for you find one that does.
Not that this is really worth us arguing back and forth... however it isn't myopia.
https://support.microsoft.com/en-gb...-longer-backed-up-to-the-regback-folder-start
"This change is by design, and is intended to help reduce the overall disk footprint size of Windows. "
MS has stated in an official document that this change which took effect in april 2018 was designed.... no claim of a bug or someone missed a fix. They claim it was designed and is working as intended.