Love the different approach to the same problem "packaging vs performance". Not having tall upper shock mounts is a win.
But I agree there are more moving parts. Moving parts wear or break. AND the weight of the extra hardware, links, pivot, cross tube should all add up to more than the upper shock mount would be. They would also be more likely to break.
I can see where maybe a Jeep LJ owner that wants more wheel travel but does not want to cut the OEM chassis or tub. This could be a viable bolt on option to avoid that.