[dmitriid]

If you're going down the analogies rabbit hole: let's say your front door is unlocked. Should you then just open all your windows because, you know, everyone already has access to your house?

> when we can get nearly identical behaviour using push?

The devil is in the details: is it nearly identical behaviour? How nearly is it identical? I personally don't know.

[admax88q]

One wakes up the background page on a timer, the other wakes it up based upon a external controllable trigger. It's trivial to fire that external trigger based upon a timer.