Ctrl-a and Ctrl-e are much faster to type than home/end and do the same thing (assuming a standard readline-enabled command line).
All the keys in the cluster above the arrow keys are really too hard to reach to be of real practical use, IMO. Actually that includes arrow keys as well. Just too far from home row.
Oh that's interesting. You thought it was a back key? That's very interesting to me as I've been using computers since before a 'back button' on browsers was a thing.
I actually thought it was like a reset button, like when using a browser, pressing home would put you into your home page. If the name was start, like end, I may have tried to actually use it for text editing.
And those who don't want to translate it, "Home" is "Mold" in Finnish, a running joke that the button is never used lol.
I've only had issues with embedded serial consoles and things where you have to swap ctrl-h/? for backspace. But usually it's solvable with key mapping.
Also you mention vi/m but insert is red? That's the toggle switch between insert and replace mode (i vs shift-R)