@Patric C. Notepad3 does an excellent job of fully replacing Windows Notepad and I usually supplement it by merging a registry script to extend file associations to *.reg, *.xml files and others I frequently need a text editor for. Don’t understand why EmEditor can’t do that.
But your second observation gets to the crux of my complaint about EmEditor: after you spend hours and hours customizing it there is no way to quickly and easily set it up again if your PC crashes or if (as I do) you do a clean install of Windows. EmEditor is a great piece of software but I this is its achilles heel for me.