The point is that it's all based on a unified groundwork ... and developers can focus on keeping their app updated in that singular OS. Any users that have Windows 10 now will be able to use the same apps in Windows 10 several years from now. Whereas with macOS ... devs more often than not (especially lately) stop supporting the older OSs a couple years back (the nicer ones offer older support). So new apps might only work back to Sierra and nothing older. If Apple followed this similar upgrade path, apps will continue to work for years to come. That's all I'm trying to say. And if they followed what MS is doing, older hardware would be able to hold onto newer updates much longer. So Windows 10 and macOS, while similar, are also very much different when it comes to software compatibility. Apps in Window receive much longer support than macOS ... so if you're dependent upon a certain workflow you won't have to worry about it being disrupted.
As a person in a household of Windows users? Things break all the time with 10 updates, sometimes the OS itself.