Should be playing D&D instead
Yes, but those are technical illustrations and diagrams - not art by definition, per se, which requires a modicum of expression to be involved. They communicate factually, not as expression, because their job is to convey information rather than emotion. Much as a plumber doesn't express themselves through their pipefitting, a technical illustrator doesn't express themselves through diagrams, and an electrician doesn't express themselves through wire work. It's just people doing a functional job because it needs to be done.I would say being able to produce images that are technically proficient but not particularly evocative could be analogous to plumbing.
I suppose it's just splitting hairs at this point, determining the line between art and not-art. Especially when it comes to "functional art" in technical documents - are maps considered art? Some say yes, others say no. But there's no argument to be made that maps don't belong in a module, regardless of their status as art or not, purely because they're so damn functional and something of a linchpin for running the adventure.