We all have our process and do what works for us, I started using 2 wrenches way back on a stubborn one, it worked much better for me so I do it every time instead of winding it up and not being able to get it off or pulling threads out of the arm.

I know the flats are for threading it into the crank, I like to get them snug, I use them for the backstop wrench as well.

As I've stated many times, I have decades of experience as FoMoCo and ASE Senior Master Technician, bikes all my life and Drag racing mc's for 30 years.

I've seen a lot, done a lot, saved a lot, solved a lot, avoided a lot, made a lot and fixed a lot doing this so YMMV.