You have anecdotal evidence that there are lots of "subtle" cheaters and I have anecdotal evidence that there are not lots of "subtle" cheaters.
How exactly can you have evidence that people aren't subtly cheating, when the entire nature of subtly cheating is that it's extremely difficulty to identify? You could play for the next 10 years, and never be able to tell for sure, for example, that someone was using a "no-recoil" cheat.