People who can't lift a bag of wet grain have bigger problems than what method to use.
"it's so heavy". WahWahWah
Well, I weigh 135 pounds. And 40 pounds of wet grain weighs about 80 pounds. I also have pumps to move water and wort, so I don't have to lift it. Why would I strain myself trying to lift a grainbag? I guess I'm not man enough to do BIAB.
You don't have to do it "my way" of course- but being insulting to those who do things differently rankles me.