Mine have always had a petcock, so I just left it running and turned the petcock off. Once it died, I'd open the bowl drains and get what little bit was left.
Even if you don't have the vacuum line, you *should* still be able to turn off the petcock and shut off fuel, but I'm obviously not familiar with what you had.
So long as it worked for you, that's great . I'm just not a fan of pulling the carbs out to clean them more than necessary... When tuning the bike on the dyno I had the carbs out a dozen times adjusting jets and needles and such... That was enough for a while.
My friends always turned off the petcock when storing their bikes and the carbs would go dry through evaporation out the bowl vents. When they would put fuel to them the crud left in the bowls would often get up into the pilot jets and cause issues I am sure you know about. They would bring me the bikes and i pulled and cleaned the carbs. It was somewhat profitable. This led to me doing a lot of up-grades seeking horse power. Love to practice on everybody elses equipment. R&D can be so expensive.......
Leaving my petcock open kept the bowl wet and I never had these issues.