They are until you mod them. Lots of ways to get it wrong.
Jeep death wobble is common on lifted jeeps. The typical solution is a steering damper. The correct, and often overlooked, solution is to keep the panhard bar and tie rod in parallel. This is accomplished with a draglink flip, dropped pitman arm, or both.
Another example of problems with lift kits is that lifting the vehicle will change the pinion angle as well as caster angle. This leads to excess driveshaft wear and way oversensitive/uncontrollable steering. You'll see (expensive) adjustable control arms that are advertised to address this problem. They don't maintain geometry through the entire suspension travel. The bushings also wear out pretty fast, even if lubed. When you hit a bump the caster angle still changes because it isn't constrained to maintain parallel. The correct solution is a fully boxed control arm bracket. It uses the stock arms and maintains geometry through suspension travel.
https://en.wikipedia.org/wiki/Four-bar_linkage