> That's why I wrote "To me Vim seems...".
That's fair. I was left with the impression that you did not think it could be useful to anyone.
>Beyond the fact it's impossible to start using it right away without instruction, everything else is subjective and context-dependent.
It is a very different interface. It does not work like other editors. Some people don't like mode-based editing, and thus they will definitely not like it.
> How? I tried.
This is a common experience for people attempting to learn Vim. Like I said, the learning curve is high. It takes a long time to become proficient. As to how it is worth the investment to me, I think most of the gains come from the fact that it is a keyboard-oriented editor. I can find the piece(s) of a file that I want to edit, and make changes quickly. As 'blackcats' pointed out elsewhere in this thread, vim lets you move around the file quickly.
> I also find coding without JetBrains-level smart code completion a waste of time.
I use the IdeaVim extension for vim-like keybindings in JetBrains IDEs. It's not perfect, but it implements a fair bit of the keybindings in vim. I understand the desire for code completion, it can be very handy.