I've never done any of this with NO problems starting any of my vehicles or lawn tools. To each their own tho. Now if my car sits for a couple weeks or months, I shake the fuel up(in the car or remove the tank with the Vertigo quick release clips) then start.If I keep gas in the tank on my Losi & Vekta, I always start them once a week and clean the plug after I shut them down.
If I don't run them for a while, I empty the tank and suck the gas out of the fuel lines.
I always change the plug once I am ready to run them again.
This works for me.
DDM suggest never to leave gas in the tank and to pull the battery and discharge it in storage mode until you run again.