Most axles break because of your thumb. Not the lift itself although there is a limit on an axle and putting it in a bind
honestly it all depends on you and the way that you ride. I could ride with that set up for a long time and never mess anything up. But I am old, slow, and methodical about the way I approach everything. If you live by the "when it doubt throttle it out" then you are going to break things wether or not you lift it, its just a matter of time. JMHOIn your opinion if I did a 1.5" lift with my 28" tires would that be to much?
Biggest difference is the travel distance when it comes to spring spacers or bracket lift. With spring spacers you max the shocks out to full length, removing the sag, giving you more clearance.
Bracket lifts are bad because with those, when your front end comes up, you now have the full length of the shock, plus that extra 2" and that's what puts the extra/excessive angle on your axles! Then they go pop a lot faster..
Pipe lift or shock spring spacers is the best way to go!