I'd argue that this generation's skill-set is simply so different from previous generations that it only appears that we can't do anything, as we can't to anything that was important to the previous generations.
Example: While I can't do the metalwork and hands-on fabrication that my dad does (he's teaching me a little), I can design, test, and fabricate my own parts through CAD and 3D printing. From a more philosophical standpoint, I would say that the workload has changed from physical to mental; I don't use my hands, but I have to consider a lot more variables simultaneously to produce a complete working model.
Separately, I'd argue that the only reason my generation appears to be useless is social media... Back in ye olde days, every small town had a group of kids that did absolutely nothing, but the town was generally isolated from the same groups in other towns. Now, the idiots can amass on social media and it gives the illusion that a significantly larger group of idiots exists than really does. What about all the middle-aged drug addicts in the midwest? They're not millenials or GenZ (whatever), they're of the generation that complains about my generation, but they nonetheless contribute jack shit as well.