Hello, I am considering to buy a Windows laptop. Trying to decide between a FHD and UHD screen option. In the past I read that Windows 10 had some scaling issues in 4K. Have they been fixed? If my external display (TV) is 4K, is it better to get a laptop with 4K screen to avoid issues caused by the machine driving two displays in different resolutions? If I go for 4K laptop, will I have issues in using it with projectors at schools?