It's not accidental. its the "unexpected behaviour". Tab, enter etc serve exactly the same purpose all the time. Backspace doing delete one character or delete everything depending on where the mouse is pointing could probably only be beaten for stupidity if pressing the enter key while the mouse is hovering over the close button actually closed the entire browsing session.

Because, as power users, who use both the keyboard and stateful pages, forward "rarely" restores the state and is technically forbidden from doing so.

So an accidental thumb tap a touchpad + trying to delete a character produces a wait for the entire app to reload and then get back to where you were - which can take minutes assuming you were lucky and said app hadn't decided to wait 30 minutes to autosave.

In fact I had turned off fast tap on the touchpad for exactly this reason, glad I can turn it back on again.

If moving the mouse to the backspace button (seriously, the whole point of keyboard shortcuts is for people typing with both hands and not using the mouse) is such a problem, clean the mouse and turn up its sensitivity.

Or better yet, get a touchscreen, you'll never want to go back to mister mouse.

Because chances are that it doesn't work, for various reasons, some of which are outside the browser vendors control.