There's nothing better than a huge display with high resolution, keyboard and mouse. The computer might be in a separate chassis or a laptop or whatever but a huge display and a mouse are indispensable.
API requests when testing and so forth ... for whatever reason a separate set of physical keys makes more sense in my head.
I saw it recommended here a while ago, haven't tried it myself.
https://shop.pimoroni.com/products/keybow-2040?variant=32399...
I get the appeal, but I still have unused function keys. (I'm using.. off the top of my head, F1-5.)
You'll get 15-18 buttons you could remap to trigger whatever events you want.
On the ergonomics front, I have long wanted to try out foot pedals/buttons for Shift or a few triple key combo shortcuts I regularly use in my IDE.
There might be a market for rackmountable hardware with the much-needed addition of proper RGB lighting (for improved performance).