Block sizes for dd(1) to USB memory sticks (flash drives) for installers for FreeBSD

From: Graham Perrin <grahamperrin_at_freebsd.org>
Date: Fri, 30 Sep 2022 07:26:43 UTC
<https://www.freebsd.org/releases/13.1R/announce/#_availability> and 
elsewhere:

bs=1m

Why so small?

I find things much faster with a larger block size. Is this my imagination?