two workers in skilled jobs, let's say they're dentists. [...] So who do you go to, when you need some work done? The one who has devoted her life to dentistry and does it every day, or the one who sort of does it on the side when she can be bothered?

So you only read the first half of the first quote? Reading the entire paragraph makes it clear that it's not referring to dentists:

technology has been marshalled, if anything, to figure out ways to make us all work more. In order to achieve this, jobs have had to be created that are, effectively, pointless. Huge swathes of people [...] spend their entire working lives performing tasks they secretly believe do not really need to be performed.