I believe that's precisely the species of abhorrence that I was referring to, actually (abhorrence since it basically leaves no patent standing.) I have met it before!
As for the article, "no empirical evidence that they serve to increase innovation and productivity" is obviously outright false. We certainly don't have proof, but there's a helluva historical correlation between patent enforcement (or existence) and countries with strong economic growth, particularly in technology sectors. That has to be referred to as evidence - since evidence which cannot be misleading, i.e. "incontrovertible evidence" is actually proof.
Moreover, histories of technology often show simultaneous invention, and in such cases, the obscure and unsuccessful efforts very strongly tend to appear in areas where patent law is not efficient or respected, and therefore investment for development of inventions is lacking. Without his patent, James Watt could not have and would not have (finally, after a long effort) found a sufficiently rich partner who could fund the development and production of his new kind of steam engine.
Note too that even if patents weren't globally efficient (which I strongly believe they are), they nonetheless attract inventors to your country and so are locally efficient (a prisoner's dilemma that only coordination through treaties would defeat.)
This doesn't mean that present patent law is ideal, or that the historical context hasn't at least partly vanished, however: very complex technologies (which we're now awash in) create situations in which it may be more valuable to cease to produce smartphones and instead use patents to hold a gun to the head of others and merely extract rent from those still producing them (sneezeMicrosoft.) Since you aren't producing phones, others can't retaliate by refusing to license their patents - you no longer need their patents. When more than one (or perhaps a thousand) IP holders want to extract rent from the same item, obviously this can introduce great inefficiencies. Few patents are truly essential (outside FRAND standards, a different situation) but many are costly to get around. One way or another, sooner or later, we may have to deal with this situation. I wish I knew just how.