The newer Colorado/Canyon series has electric power steering that stays connected until power disconnected from battery. GM claims damage will occur to the steering otherwise. Great threads on this subject on the IRV2 website.
2004 Tiffin Allegro 32BA 2005 Honda CRV Toad Pretty wife of 34 years as copilot
I would follow the manufacturers instructions. You might screw something important up if you don't. If you really want to know why call the manufacturer and they will tell you.
I donโt know about just pulling a fuse, but donโt they make a switch that can be attached at the battery to accomplish the same as disconnecting it.
Tom Wilds Blythewood, SC 2016 Newmar Baystar Sport 3004 2015 Jeep Wrangler 2dr HT