Having twice rolled the CJ-7 with the Rock Hard cage, without shifting any joints or bending any cage elements, I disagree. Go ahead and try to shift one of the bolted joints. The billet ends are welded to the tubes at the factory -- then the billet ends are bolted around the joining tubing where intersecting tubes meet. There is nothing wimpy or inadequate about this method of building a cage. Actually, taking one of the joints apart after it has been torqued in place requires a very large hammer because of the tight tolerance of billet to tube, even when all 6 bolts have been removed entirely. Even the end caps won't fall off and have to be driven off the tube.
Most of your vehicle is bolted together, but that doesn't generally present cause to pause. Your suspension is bolted together, but works just fine. The clamp force of the billet joint is incredible, and won't break along a weld, as a mitered, welded joint can under stress if not properly done. The Rock Hard cage can be assembled inside the vehicle and there is no welding splatter to damage the interior. Minor fitment adjustments are possible to accommodate the vehicle, which can only be done with a welded cage if it is fitted and welded in place. The Rock Hard can also be removed if needed (when you sell the car for example), which a welded-in cage generally can not.
Keep in mind the vehicle into which this particular cage is being installed. From the photos it does not look like a gutted out dedicated rock buggy or bare-bones trail racer, so the bolt-in cage may well be the best choice on the market if the interior of the vehicle is to be left as is, and not damaged in the process.
At any rate, the cage is more than sufficiently strong for sporting purposes, served me very well in racing conditions in the Outback and elsewhere, and I have no complaints. I would venture to say that the bolted billet joints are every bit as strong as a mitered weld joint, if not stronger because there is no distortion or tempering changes which arise from arc welding on chrome-moly tube.