I guess it just depends on personal preference, i know when i go into places at least around the South Dakota area, i want empty circuits and nothing else. Also i would be very cautious of pre hung truss as i wouldn't know who set it up and how much weight it could hold. this is coming from some one who has about 2 years in the industry and feels much safer depending on my own work rather than someone i don't knows work. (no offense intended). Also as far as safety cable goes again i stress that while a zip tie is rated for 25 lbs. those are much more massively produced, while safety cable is rated and tested consistently. Not saying that weight is an issue i just feel it looks more professional and makes me feel safer when i see instruments whether it be a gobo rotators or a par can hung with a safety cable just because i know what they are rated for and know that it is an industry standard.
You do realize he is talking about clubs that are no larger than your garage right? No band who plays venues that size carry along LDs, let alone lights. I think the system he is talking about seems really appropriate for the kind of stuff going on in there.
I'm gonna back up John here and say safety cables are not needed, they weigh more than the fixtures he is hanging. I'm still not sure what LDs he might anger out there by installing house rigs, but then again I don't want to question your experience as a two year industry veteran in South Dakota.
Also full sentences and proper grammar are a great way to get people to take what you say more seriously.