Some executives are as you say. In general, those companies which are lead by executives like that are leaders and produce high quality and innovative products that people love.

But many execs are not. They work just as obsessively as the first type, but only to increase their own power inside of the organization, at the expense of the organization's cohesion, trust, productivity, and quality. They live in a bubble, totally disconnected from the organization's purpose. They make strategic mistakes over and over again. They fail to truly understand why even a single dollar of revenue happens; instead they take it as a given that the money is coming in and only think of ways their unit can siphon off more of it, at the expense of all the others.

If just one of these type 2's enters your organization, you can typically get by, as long as you recognize them quickly enough. If even a small handful enter your C-suite, they will metastasize, cause your type 1's to leave, and put your org on a death spiral.

Many execs are of the second type. You can tell: if you use a product or service, and it sucks, that's probably what's going on at the top.