[MertsA]

The benefit you're describing is just end users already being familiar with the interface because it's running Windows. That's not the case here, the entire interface on this device is of the custom application itself. It doesn't matter that the user already knows that the start button can be used to launch new programs, they're never going to see any hint that the device is built around Windows unless it's broken. There are numerous disadvantages to using Windows for a heart monitor, everyone else has described this to death but the only real benefit to using Windows is that development doesn't require a software developer competent with embedded work. Now they can hire any Tom, Dick, and Harry from the local community college because it's just a Windows app.