linux is not familiar to windows users though
a slightly closer UI would not change how many other things are done differently between linux and windows

it would still not change the perceived difficulty of linux, people thinking you have to use the command line, or windows being preinstalled on everything, or some apps not supporting linux, or people not knowing WINE exists, or the many bugs i have encountered, or there being so many distros to choose and people getting confused, or people not having the time to switch to linux, or not caring about their computer, or people being afraid of change, or the many other things i have not listed