You should check with the lift manufacturer's specs. They will generally give you a minimum distance from wall. Mine is 6 inches minimum.
As for being able to walk around it... yeah that's probably nice, but doesn't really cause that much issue. There's ample room to move on the side nearest the wall between the lift post and arms on mine. And when it's up on the lift it's not even a thing.
As for making it more narrow. Definitely check with the lift manufacturer. These things are engineered a certain way so if you go changing things it make make the lift unsafe. Not something you want to find out when under your car.
Fully up, I agree, it’s not a real issue. Having to do the walk around when your truck is at a comfortable work height, say in the 3’ or 4’ range, ie for brake jobs, pulling axles, or suspension work is the issu.
Oll changes, exhaust work, etc…no problem.
I located the outer post on my 10k Bendpac asymmetric lift something like 24” or 28” from the wall, but the corner of the reservoir reduces clearance some. If I was doing the install again, I would add an additional 6” as a minimum.