Yeah, except it usually would be (in the best case scenario) more like "520 with a SD of 40" for 10 people and "1 outlier", which you wouldn't really be able to

Yeah, except it usually would be (in the best case scenario) more like "520 with a SD of 40" for 10 people and "1 outlier", which you wouldn't really be able to properly conceptualize let alone explain, since your "outlier" is freaking 10% of the group. That is, ignoring the fact that experiments without a control group can be hardly considered valid at all.