It really isn't. And note the third xkcd is still stick-figure, and the OotS does something that would break many artists in a more complex style (I mean, KSBD's artist could, but
very few others) and as a result, it can do that sort of strip at a regular pace.
Here's a post of the OotS artist's other more detailed art. Does that look good individually? Sure. Would it be up to 'two T-rexes fight around a fire with hundreds of soldiers'? Hah. It'd be a cluttered mess and it'd be hard to make out everyone at a glance at that level of busyness.
Doing simpler stuff when you can do complex is not 'jerking off to the audience,' it's showing that the artist things simplier is the best way to convey what they're doing- whether it for clarity, complexity of scene vs complexity of elements, or so on.
You're really projecting your preference onto a heck of a lot.