https://www.theverge.com/2016/1/16/10780876/microsoft-window...
We may need at least another data point, but it does look to me that Microsoft has gotten much more aggressive about dropping support for older hardware. It probably a result of Nadella's cut of the Q&A team. If the Q&A team is cut, it makes sense that less hardware would be support, and that you'll also see more bugs in the operating system.
> Despite being Microsoft’s newest and ‘most secure’ operating system, Windows 10 was found to have the highest proportion of vulnerabilities of any OS (395), 46% more than Windows 8 and Windows 8.1 (265 each).
https://www.avecto.com/news-and-events/news/94-of-critical-m...
It sounds to me like all of those anti-exploit mitigations that are supposed to come to Windows 10 will be needed just to make it as "secure" as previous versions.