It's not really large in terms of memory on any remotely modern system. But it is large in terms of learning curve. Emacs has a ton of concepts and interface q

It's not really large in terms of memory on any remotely modern system. But it is large in terms of learning curve. Emacs has a ton of concepts and interface quirks that don't transfer to or from other common software. It has it's own keybindings, even it's own way of documenting it's keybindings, that shares no similarity with what the OS considers standard. So there's a huge amount of pain in switching too or from Emacs.