defmt_brtt::init!() missing in init task

[90degs2infty]

According to defmt_brtt's docs, one has to initialize defmt_brtt before using it:

You must also, somewhere in your code before calling any defmt logging function, call the defmt_brtt::init! macro.

fn main() {
    let _ = defmt_brtt::init!();
}

This template's init task currently reads:

#[init]
fn init(cx: init::Context) -> (Shared, Local) {
    defmt::info!("init");
    // ....
}

Is there a reason why the initialization is skipped? Or is it not necessary in the first place? It apparently works without the initialization, but I'm a little puzzled by the docs, still.