Square parachutes?!!...Like that'll work...
But seriously, I started in '80 or '81. Experienced jumpers were all jumping squares, mostly 7 cell, but a few 5 cells. I started out on Paracommanders, and then a Stratostar (170sqft 5 cell) and then bought my first and only new rig, a 220sqft Pegasus in a Mirage.
When I got out in '88, canopies were just starting to go high-performance, which made little sense to me, because to me, the parachute was purely a life-saving device.
Overall, it seems that the sport has become safer. Apparantly, AADs actually work these days, whereas the early ones did not. Deployment altitudes seem to have moved up. We used to take 4-ways down to 2,800ft back then. Crazy, but pretty much standard. Seatbelts on below 1000ft...can't hurt, since noone's bailing out anyway. I believe you have my stapler.