Is mixing Desktop OS with mobile OS a good idea?

Back in the 80's every app had it's own dialog for saving files. No graphical user interface was available for PC users. In the 90's things were a lot easier with for example Windows. You only needed to learn to save in one app and all other apps behaved the same way.

It seems we are going back to the 80's. How come?

1. In Windows 8.1 and 10 there are two different ways to save files; the old way and the Modern UI -way. I have to ask: why Microsoft why?
2. There is a rumour claiming Android and Chrome OS are becoming one. We've already seen some Android apps on Chrome OS.
3. iOS and OS X from Apple will also co-operate in the future. iOS apps are said to work on OS X.

All those three operating systems (Windows, Chrome OS and OS X) will be somewhat different from now in the future. They will be able to run mobile apps which have different user interfaces and different ways to save data. Users will be lost in those kind of jungles!

So, is it a good idea to mix two totally different operating systems?

• At the moment it seems Windows 8.1 and 10 have no future. Mixing old Desktop and Modern UI is *a no-go*! Sorry to say that.
• Google is also in danger. Chrome OS is trying to catch up Windows. Will this be possible by blending Chrome OS and Android? I doubt.
• OS X is a very "traditional" OS. The original 1984 Mac and it's GUI looks a lot like, let's say, OS X 10.10 Yosemite. Mixing iOS and OS X is not a good idea since many Mac users are also very conservative and don't like major changes.

However, who says the only way to do it is to mix the OS's which we know *today*. There is plenty of time to develop something totally different and new. In the 2020's operating systems will look and feel different from now *for sure*. Let's hope we are not jumping back to the 80's.

Windows 10 won't make it, I'm afraid