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Generally I would agree with you, as the 10 year lifecycle you described is what’s to be expected. With Windows 10 however, Microsoft said on release it would be the last Windows and they move to windows-as-a-service. So Windows 10 not being the last Windows and the upgrade path being closed by default for many older PCs is newsworthy.
Microsoft never said that, though. One person said that and tech media ran with it like it was gospel (and Microsoft didn’t correct it, which is absolutely their fault, but still, that was never an official statement but apparently something that was just poorly phrased)