Absolutely. The bigger the bag the better! The bigger the pot then no need for a sparge if you can get your full volume in one go. I can't....so thus the dunk.
It's down to space and money. I've found personally that I've spent a lot of time and money making my mash tun and sparge arm, taken up...
You obviously don't have to. You can hoist and drain...such is the biab method, but I've read many different people's take on the bag and I'm experimenting to see what works best for me. So far, a drain and a dunk sparge sees the best efficiency for me. I plan to see what efficiency I get if use...
I've been messing around with converted coolers and copper manifolds/pvc sparge arms and the like for about 18 months. Then I got a bag that fit my cooler and pulley system. Dirt cheap...less hassle and I'm even seeing improved efficiency with the bag. Im going to to try a batch sparge next brew...