This is one of the biggest annoyances in Windows 10. If you use Command Prompt and have several of them open with overlapping windows, then it is impossible to see where one window ends and the next one starts. If you have text in all of them you'll frequently read text from the next window and then realize that text is not in the current window.

Windows 10 UX is under the control of the guy who came with the Flat UI and they don't care about annoyances such as this. They are very dogmatic, and no matter how many people complain they aren't going to give up any of their Flat UI principles.