Yeah, Karabiner seems to be unmatched in terms of customization for power users. The main problem with straight key remapping is that you have to deal with the application layer having different keybindings for the same actions, even when you have the appropriate keys swapped. Same for navigating the OS if you're interested in duplicating Windows navigation functions in Mac ( Command+E to open Finder, Command+S for Spotlight Search, Ctrl+Shft+Esc to open Activity Monitor )

I spent a long time creating a giant karabiner config file for myself, but recently an MDM update at my work broke the virtual keyboard driver that Karabiner requires. I haven't figured out a way to install it. I may have to go begging to IT.