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.
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.
This is a gross oversimplifcation
They also cannot opt-in if you don't have electricity in your house or don't own a computer
DOH!
This is not a real argument
A real argument is obsolescence
Of course there's a point when older versions are not supported anymore
Here we are talking about future versions breaking compatibility, without a shared consent, without a deprecation roadmap, that need to be supported, in a Chrome specific way, making Chrome the new IE for no real benefits to the user and a vendor lock-in by Google
When they users will try a different browser, for whatever reason, they will experience a different web, that for the majority of them being non techy will look like a broken web