Hjkl are superior to arrow keys once you get used to them.

I disagree with this point. I am able to use them quite functionally and I still want my arrow keys, because they are arrow keys. Also, you can use them without exiting INSERT mode.

I do however, agree with your last point.^[1]

Oh, and I also don’t like the pseudo ergonomics of mechanical keyboards.
All they do is make it harder to use with a more relaxed hand position.