Today, most divers spend more time, thinking about possible problems, rather than diving and experiencing real problems. . . releasing air from your tank to blow unseen water from your 1st stage is risking more problems than they solve. Blowing high pressure air is risky with no good side, unless you have salt water spray hit you just as you disconnect your regulator. Drying with a towel will remove most water with no risk of damage. Annual service can clean up what little water might get through to parts in the 1st stage. . . If you drop your open 1st stage into the ocean, take it in for service, don't play with the high pressure from a tank.
Next time you hear some new idea. . . consider the benefit - risk of of the idea. Divers have been giving good and bad advice since Cousteau. The evils of Mask on forehead, knife on inside of leg, My regulator is the only safe one, my BC, my octopus regulator. There are many things said about diving safety that are just wild speculations, with no basis in fact. Listen to these new "commandments" and think them through, go diving and think for yourself.
