> I believe Chrome on mobile is the default (only?) browser.
It's default on a lot of Android phones, but far from the only one available. I use Firefox on mine. Opting to use a non-Chrome browser on an Android phone is about as technical as using a non-Microsoft browser under Windows.
You ship an experience like that, you end up not only breaking old websites but shift the emphasis on regularly updated websites that work on mobile. That was the intent! But it is not the web we know and love.