Nor with DTP, where there are variations in ink, paper stock, the performance of specific printers/presses, etc. and ultimately the only proof is, well... the proof. If you're lucky. Yet, the industry manages.
In the film and high-end video production business, in contrast, we have people telling us that color grading is an arcane art which can only be practiced by high priests in tall towers with a quarter million dollars worth of equipment, up to and including a $30K set of knobs to twiddle. Anyone from the DTP world, who has been doing color-accurate work for years with commodity hardware and software, knows that this is complete nonsense. The DTP solutions aren't perfect, but they're good enough.
There are many people who have been in the film or high-end video production industry a long time, and have the luxury of working on big-budget stuff with the best equipment money can buy. Some of these folks seem to have developed the notion that it's not possible to make anything worthwhile with any lesser equipment. You won't see this stated outright often, because when stated outright it's obviously nuts, but it's implicit in a lot of what gets said in some other forums. Not just about color, but about lenses, tripods, audio.... It's something to watch out for.



