Hey bro good to see ya, thanks for dropping in... You're just in time for the best part anyway
I don't think pre-harvest flushing is just a myth... The vast majority of people who have done flushing vs. not flushing comparisons will say the flushed buds are smoother and have better taste. Also pretty much every mineral based nutrients will have final flush phase in their feed schedule... The Autopot guide says to run plain water for last 10-14 days as well... So I'll stick to flushing my plants and wouldn't recommend to anyone not to unless it's an organic grow.