Competition at the OS level is good. Windows getting better will only make others try harder.

As a former Windows user, then macOS convert, I look at what's happening on Windows with envy. macOS is getting prettier and perhaps more consistent, but buggier. It's very frustrating. I've had so many problems with security updates, with both the latest and other supported versions. Apple support is terrible these days. I filed a bug report with them and weeks later they give me absolutely lame replies.

The only thing that gives me pause, still, about Windows 10: it updates when it wants to and that is difficult to turn off (you can set your network to "metered" and I hear that will do it). Also the telemetry. I feel like it spies on its users more than Apple's product does.