It's rather annoying how Andriod 11 doesn't have a forward swipe gesture option. If you swipe on either side of the screen they both take you backwards. In my opinion it should be swipe on the right edge of the device it will take you back a step or swipe on the left and it will take you forward a step. This would be extremely useful when navigating on a brower like chrome with one hand, essentially for people with accessibility requirements.
A forward button is very rare for any OS. Its assumed the screen you are on is where you want to be and you move back from there. Foard button would only be used if you had accidentally moved back from where you intended to be