Oh, and I use proportional fonts so VIM is out.
I find moving around tmux panes kind of annoying and scrolling them even more annoying, but that's probably more of a lack of comfortability with it than anything else.
set -g mouse on
That feature is built into Vim with quickfix commands.
> multiple files open in multiple panes
That's also built-in.
> a file list
There's at least two built-in features that provides this, netrw and quickfix.
> list of currently changed files
That's also built-in? It's like the most basic of features.
> I use proportional fonts so VIM is out
You can use a terminal that supports it, or perhaps some NeoVim UI.
Regardless, I have no plans to switch because I can't see it improving my productivity enough to justify the learning curve.
I'm just pointing out that all the features you've listed as lacking in Vim are built-in, widely used, and documented. And of course, these features can be used at the same time, there's nothing preventing you from doing so.