Seems like you already went through the journey :)
I would say though before switching to Linux, switch all your critical apps to the one available on Linux first. Get used to it and when your are finally comfortable, switch your OS. No need to switch all of them in one go. If for whatever reason you are never get comfortable with the trade-off, just stay on Windows. It is fine.
Yeah, it is inches too in Southeast Asia. I guess simply converting current size screen to centimeter just makes the number awkward. For example 14 inches is 35.56 cm. If display to be measured in centimeters, I think the sizes will have to be different to make it marketable.