You aren't reading the full story about the importance of suspension geometry. Don't focus solely on arm length. Pay more attention to the mount locations and learn what the instant center is. Lifted short arms have problems, no argument there. However, bolt-on long arm kits trade one poor suspension for another because the mounts are never in the right locations. Again, you need to know what the instant center is in order to understand this. Then there is the clearance loss created by many of the bolt on kits.
The bottom line is that unless you can weld, there is no overall gain. All you are doing is trading one set of problems for a different pile of crap.