No offense taken, your totally right, if we didn't make "mistakes" we would never learn, sometimes we forget some people are doing this as a career, whereas others are doing it as a hobby, and still somewhat further down the learning food chain. I totally get what you’re saying, and understand commercial mastering is a skill developed over many years, with no pre-set shortcuts to natural intuition and knowledge and experience in musical theory, scientific, technical and even physiological aspects.
I guess what helps me with "pre-sets" or more so pre-set templates in the self learning process is to provide some direction on modules used, placement in signal flow, and intent to achieve a certain overall sound or effect (affect), say like the "Loud and Scooped", mastering template, or in individual modules like Sonitus MB, “Smooth”, Hard, soft, etc. and still learning what all these terms mean audibly, so wouldn't say they're "virtually useless" in the learning process, and apparently they are provided for some reason (?). While Ozone may be way over the top with hundreds of combinations possible between overall and individual module pre-sets, and may be somewhat like a "randomizer" it still exposes you to possible choices, and allows you to hear how certain choices can affect the overall sound.
Cheers