I spent four years wiring houses/apartments, and then moved over into commercial. I wouldn't consider taking a commercial maintenance position without some standard commercial experience - it seems to me that there would be some big holes in a person's experience that might end up frustrating either you (the employee) or the employer.
But I don't do maintenance, mostly just installation, so take that for what it's worth.
I am just thinking about what I've seen over at Colorado State University, in my trips over there. They have a maintenance staff of all trades, and some of the stuff you see in some of the older buildings displays the headaches of people who didn't think ahead either out of laziness or lack of forward thinking, one of the two. Now days, they are pretty particular about how the new work is done, in order to avoid the headaches present in the older buildings.
If someone were to go into a maintenance job like that without knowing what good work was like, and how to make things better, it would add to the congestion, IMO.
I hope that makes sense, I don't think I expressed what I'm trying to say very well.