https://ux.stackexchange.com/questions/53176/why-does-backsp...
Other times, focus detection breaks randomly and you're in a text box but something happens and, whoops, off you go to the previous page. I don't know how often these early web guys thought we'd be going back, but mapping it to one of the largest and most frequently used keys is asinine.
Andreeson recently said that his team always thought of the front and back buttons as half-assed solutions until they could figure out something better. Guess that's probably never going to change.
Good management involves prioritizing these things in order to sort out the contradictions, and good employees help with this process by pushing back against directives that contradict what appear to be more important goals.