Only nobody cares from the TECO community -- and you can still use TECO for your texts without the new "apps".
But a web where people code for a specific browser, is less fun (or even downright unusable) to surf with another browser. We learned that in the Netscape/IE wars era.
>More seriously, there are quite a few differences between adding a feature to an open-source project and adding a feature to a web browser shipped as an inseparable component of the operating system installed on 99% of personal computers.
That's all well, but browsers can gain market share too. IE had a minority share at first, despite being bundled with Windows -- people just preferred Netscape. So that Chrome is not bundled with an OS is not much guarantee.
Not to mention that in Android, Chrome IS the IE.