That's not completely true. Karabiner does something MacOS cannot do, which is a momentary switch functionality. For example, I use it so that tapping capsloc

That's not completely true. Karabiner does something MacOS cannot do, which is a momentary switch functionality. For example, I use it so that tapping capslock will activate ESC but holding it down with another key will activate CTRL instead. It's such as cool feature that I can no longer use a keyboard without this functionality. I can also do this using Hammerspoon, although I prefer doing it via keyboard that supports it (ie QMK firmware-based keyboard) so that I can use it on Windows / Linux as well.