[CMcAllister]

With hole spacing being the same on the chassis bracket, the shorter bar will be a much more drastic change when moving the front up or down a hole. It can go from too much angle to not enough, (too much change in IC location), with no way to split the difference other than a ride height change.

Also, the IC change throughout the normal rear housing movement will be much greater, depending on how much the rear moves. Even if you've found the sweet spot, this can still cause problems.

IMO, the short bars were a compromise for the situation at the time. The trend now is to make the adjustments finer, with smaller holes in brackets, tighter center-to centers, multi piece brackets allowing for 1/8" changes in location, and/or longer bars making this so.