That's an ergonomic nightmare. The right-click->Back approach works too, but some sites like to mess with that and I must watch out to not click the wrong element, so backspace is still my go-to choice.

Not everyone is using a desktop keyboard, or a US keyboard layout.

FWIW, on my laptop, ALT+Left would be a full spread of the hand and I have to move my torso to get the hand in position.