I often see people with a flush-mount panel in their garage who want to install some EV charger or NEMA 14-50 receptacle that requires new wiring from the panel.
Unless the desired charger / outlet location is in the same stud bay as the panel (e.g. immediately below it), it's painful trying to run the full length of wire inside the wall through several studs until the desired location. It's much easier to use surface-mount conduit to make the full trip.
I'm aware of 2 ways to "break out of the wall" from a recessed breaker panel to surface-mount conduit going somewhere else:
In-wall wiring from the panel to a metal box in the same stud bay (e.g. below the panel), then add a metal extension ring on top of the box with a blank cover, and use one of its knockouts for exiting via conduit.
Flexible conduit starting from a knockout at the top of the panel (in-wall), and curving and exiting from a hole above the panel. That hole can then be foamed closed.
Out of these, #1 sounds much cleaner and simpler to me.
Are there other common ways to do this? Or other trade-offs with these or other approaches that are worth knowing about?