well lile, i would say to reduce random outcomes primarily.
I remember reading somewhere years ago that Headrick was attempting to replicate throwing a disc to a person when he designed the polehole. Don't you want that guy to catch the darn thing?
That's true...chain assembly to top of the cage is supposed to roughly represent shoulders to waist at the width of an average person. Given that, should he (the target) be expected to be the greatest guts player in the world and catch anything within arms' reach when thrown at any rate of speed, or should expectations be that he'll catch reasonable throws that hit him "in the numbers" (to borrow a football term) and be iffy on the stuff that's high/low/wide of center?
I subscribe to the notion that there's no such thing as a universally perfect disc golf target. There are just a bunch of very subjective opinions on which one is ideal based on personal throwing style. Every target has its sweet spot and its weaknesses. The "problem" is that they are all different and few people have the patience or the memory to remember them all and adjust their throws accordingly. Hence the targets that catch their throwing style best are great and the ones that don't catch their throwing style as well "suck".
The flaw in the Chainstar, since that's the focus of discussions here, is the single ring holding all of the chains at the bottom. What happens with many putts that hit "center" (usually just above dead center) with significant velocity is the disc pushes the outer chains in, which lifts the ring and as a result slackens the inner chains so they're not absorbing the disc's energy. This allows the disc to get to the pole with velocity, which causes bounce outs. Additionally, when the ring drops back down, it pulls the inner chains taut rapidly, resulting in them springing the disc back out away from the pole.
In contrast, targets with two rings, one for the inner and one for the outer chains (such as on Discatchers, Veterans, Mach anything, etc) will receive the exact same putt and the inner chains are independent and are able to absorb (deaden) the energy of the disc more and let it drop into the tray without either getting to the pole or being sprung back.
Of course, there are ways to putt on a Chainstar such that spits and push outs like that never or rarely happen, but it requires hitting it a bit lower or slower than is necessarily controllable for pretty much any player from outside of, say, 15-18 feet. I mean, it's tough to adjust the speed of the disc by a couple mph or the height of the disc by a couple inches, at least not intentionally and consistently. Even for the very best putters in the world. But there are surely plenty of players who putt with just the right amount of speed, height, and angle that they never get the Chainstar bounce outs. Are they doing something wrong (and the target is rewarding poor putting) or are they doing something right for that target that might not be as effective on another style of target?
I think Chuck's on the right track that there would need to be objective testing to determine the truly "best" target. And before we can do that, we'd have to agree upon what is the ideal trajectory of a putt...ideal speed, angle, height, etc. Short of that, it's all opinion and personal preference.