The BAT text notification rewards are off by default. The adblocker is on by default. How is that replacing?

If you turn the BAT rewards on, you get system text notifications at intervals, it's not anywhere on the site or triggered by browsing.

They are two completely different features. The adblocker is a basic utility for everyone.

The BAT rewards is an optional program you can enable if you want extra tokens.

It's a real user agent, as in, for the user.