The fewer features the browser has, the more code ends up as native apps or on cloud backends instead of the user's device.

How many IoT devices could have just used bluetooth for interactive with them, but instead they all phone home to some central cloud server because the user experience of just hitting a web page is better than installing some clunky native app.

Should we "just go ahead" and expose everything? Of course not. But there's room for thoughtful implementation of these features that users want. A super secure platform that nobody uses provides security to no one.