No, I add "good" because just by doing these things you named, people expect to make incredible music and when they compare it to professionals mixed & mastered track, they feel like complete shit because they thought they only needed to do those things.. but no, they need to do it in a good way.
There is no good or bad way, but there sure is a quality way.
"why saddle someone with additional task of determining if their choices are good or bad without giving them a benchmark to compare against?"
Because that is the only way they can make progress. If they don't determine wether it's good or bad, how will they know they are making progress. As far as the benchmark, 1 - they are the ones who have to train their ears & 2 - what can sound good to me might not sound good to them.