Plus, I had gotten to a place where my tiling WM, tmux, terminal tabs, and vim tabs were all competing for keyboard shortcuts, and it was driving me crazy.

I admit, this is so bad that occasionally - and especially if I make the mistake of stopping to think about it - my brain freezes and I can't remember the chord for a few second. What helped immensely was first kmonad, then Kanata, and finally a QMK keyboard. I use exactly the same keys for navigation, create, delete, etc operations, and only vary the layer key - WM under my pinky, tmux under my index finger. Helix has it's own bindings and ways of managing windows that are different enough as to not really confuse me, and I don't use terminal tabs at all, so it's really only WM and tmux. But, yeah: a Helix split window, in a split tmux tab, in a split herbstluftwm window can occasionally get me stuck for a few second as I unbox all the layers.