Being good at nano does not transfer like notepad transfers to notepad++ or kwrite.
vim does not respect nano shortcuts and modes are simply a barrier: an extra keypress and another thing to keep track of. It slows you down significantly.
Noone good at nano would switch to vim naturally, you have to force yourself to endure until you catch back up to what you could long do in nano.
Conversely I don’t know a single shortcut, behavior, or info notepad shows that np++ or kwrite don’t have. Besides maybe bracket and quote completion in kwrite which you’d have to disable in settings.
And on the other hand the advantages are more directly visible, like tabs, syntax hilighting, …
You might not immediately intuit the shortcuts for tab management, but you can still use tabs and then not return to notepad due to missing them.
I was talking about the new user experience. No new user can navigate without the arrow keys, the most you can expect is looking up i and esc to enter and exit edit mode, and then using both modes the same way being annoyed at being in the wrong mode when something doesn’t work.
Keeping track of the modes is also obviously something only problematic to those not familiar with vim.