Both of you have missed the point entirely. Yes, I've seen lots of cars lift a wheel. Different makes/models of car, different drive layout, different competitions and racing classes.
BUT, just because you see certain cars in certain classes lifting an inside wheel does NOT mean that lifting a wheel is good or that it's
necessarily the fastest way around the corner. In some cases and some corners it might be, that's true. But in most cases it would be better to have that wheel on the ground-
if it's possible on that chassis with that suspension in that particular corner.
The issue is that it's not always POSSIBLE with the chassis, suspension and class rules to make the modifications necessary to do that. Picking up the wheel means you've exceeded the limit of the chassis and the suspension to keep the wheel on the ground. And on some chassis and suspension layouts it may be unavoidable. Is it inherently bad? No, but it's also not a desirable effect.
Suspension design and set up is
ALWAYS a trade off. Especially in racing, you may end up with really stiff wheel rates and fairly short suspension travel to deal with really high suspension loads from high speeds and soft tires. That works most of the time, but in some situations it also may mean picking up an inside wheel because your roll angle has exceeded your suspension travel. Now, you could set up the suspension with longer travel, or modify the chassis, or run more spring and roll rate etc so as to keep that from happening, but then the overall handling of the car might suffer the rest of the time. Trade off. Like picking lines in some corners in pretty much any racing event, the "best line" through a single corner might not actually be the fastest way to get around the track on the whole. Compromises are made, you go slower through a single corner to set up the next that has a larger lap time impact, or get better traction to put down more power coming out of the corner, whatever.
Bottom line is just because it can happen doesn't mean it's good. And it certainly doesn't mean it's relevant for picking a rear sway bar on a very basic street going A-body!
Duster's aren't substantially lighter in the rear than any other A-body. In fairly stock trim most A-bodies are in the 57/43 % for front/rear balance. It can be improved substantially, and weight reducing efforts have a much larger impact than body style.
There's a bunch of different results posted in this thread, most of the somewhat street going cars are near 55/45
Stock weight distribution for various body styles - can you improve balance w/out drastic mods?
The results vary a lot by set up, but the best balanced 67+ car in the thread is a '71 Duster at 52/48.