it was called F1
On the other hand, if there's a key on the user's keyboard explicitly labelled "Help", then as a developer you'll feel somewhat obligated to put some informative documentation into your app that appears when "Help" is pressed. "Burning" a help function into the hardware, takes away the developer's choice in whether they want to offer help or not, without needing to impose any sort of centralized QA process. The QA process is something the dev will be incentivized to do on their own, when faced with the realization of the inevitability of users' frustrated expectations when they think pressing "Help" will get them some help. :)
You have to be proficient at least with the system you are using, but people want to use software that is intuitive, even when the task is complex.
Enter was called "return"..and you know why? Typewriters...carriage return, if you have already functions why no use it? You want a Copy/Paste button too?
Yes the thing who needs 10y old dell software and always opens IE even if something else is the standard browser ;)
Also, some keyboards like sun's and some serial terminals had dedicated copy, paste, &c.
https://retrothing.typepad.com/photos/uncategorized/wp51.jpg
https://groupbuys.mechboards.co.uk/shop/hyper-7-keyboard-r3/
It's a beast.
It did nothing
Other keys that would have been great to become standard: Load, Save, Undo, Redo