It is not malevolence but more a deficiency by design. First as you said, most consultants are not real "leaders" or "tech leaders" and when you start to get experience, you leave consulting or you raise the hierarchical ladder to become a more senior manager, that spend more time finding contracts, negotiating, dealing with the customer proposals and renewal than doing the actual job.
In the end, you have juniors that are doing the tasks pretending to be sector experts or like the guy in the article, you are propulsed "CEO" of the big entity of a big corp just after 4 or 5 years of basic consultant experience, not even having worked in real non-conducting job.
In the end, when you buy a mission to such a firm, most of the cost goes to structural costs and daily rate of a chain of useless parasitic executives like directors, executive partners, vice president, that will spend 10 minutes per month reviewing slides on the project. The consulting doing the job will be paid at most the double of what a good freelance can expect.
And regarding the spirit, the fun thing is that even when you do bad or evilish things, there is kind of a mental block brain process that makes you truly believe that you are doing an useful and much needed work. Despite it not the case.
In my own case, often I had this bad feeling deep in. A background that a customer that we were negotiating a mission for millions, could have just hired a decent developer for just a few thousands euros and have quite profited from a most good and successful system.
But like, in Matrix, when you are inside the system, it is hard to consider things outside the box.
In the same way that again in the example of the blog post, I'm quite sure that the big company would been able to find hundreds of existing employees that would have fitted the bill well and better for a lot cheaper.
I would rather work for someone honest than for a bullshit artist. But I wouldn't necessarily decline to work for the world's best bullshit artist. Just that you want to be very sure you know who at the table is the sucker.
Ideally you get someone whose good at both, or at least competent at one and really good in the other, such as Jobs or Gates.
Look at DEC, a classic engineering company failure. DEC failed because they were led by engineers who didn't understand the market. It apparently was a great place to work, because they were so NIH that they built everything from scratch.
Then look at Intel, a company that is in the process of failing because they listened to their customers too much. None of their customers wanted GPUs, or mobile chips, or power savings - until they did. By that time Intel was already behind the curve.
Then look at Microsoft under Ballmer - a company that probably illustrates the point you're trying to make. But then they won with Nadella, luckily.
Apple is a bit different and a bad example because unlike other companies they attempt to define the future. Most companies aren't in a position to try, much less succeed, at this.