Should I re-braze the fender?

As old as our vehicles are, is there really any guarantee all the brazing was done at the factory? Some could have been done over the years by a previous owner or a body shop. Regardless of the source, that is the way things were done. In the early years, auto manufactures, body shops and individuals did not have what I would consider as modern technology.......wire feed welders. (Heck, I didn't own a wire feed welder until about 1990 and was very nervous to use it.)  Repairs/corrections were performed with a torch and brass rods. I've even used old coat hangers to make similar repairs using an oxy/acetylene torch. Now, I use a wire feed welder and don't even have a torch. 

We used to MIG tack weld truck body panels to on gigs and then took them off to spot weld as there was no way to do a spot weld on the gig.

I have no idea why they brazed the fenders and I'd love to hear a convincing explanation. They're held in place by the bolt at the bottom that goes vertically into the rocker area (at least on Javelin/AMX). They also brazed a lot of the sheetmetal around the trunk opening. I assume they did this to tack it in place before the spot welding as the assembly jigs were in place and blocking access. IIRC the roof was also brazed at the A pillar.
But why the fenders?
Did Chevy braze sheetmetal like this?

On my 66 classic the fenders were brazed in two places. I painted the insides of my fenders but have not installed them so brazing will burn some of the paint though it would not be seen since it's behind the splash shields. Should I bother brazing? This car will be in daily service as a second car when I'm done. I just don't want the fenders flopping around.