Or overindexing on biased data points might cause biased conclusions, without considering standard variation. Lots of people use it without any issues -- if so

Or overindexing on biased data points might cause biased conclusions, without considering standard variation. Lots of people use it without any issues -- if something isn't truly a dealbreaker, the "I won't bother" crowd tends to become a minority. The Law of Large Numbers will work as expected.