BIAB is all grain brewing. You can do AG with one, two, or three vessels. It's all a matter of personal preference, budget, available space, scrounging skills, and/or DIY skills.
Pulley's are cheaper than MLT's, and many people already have ladders (or structures over their brew space to attach an eye bolt.) If you don't have a ladder or overhead structure, then yeah, it's extra equipment. Different people have different situations. For small enough batches you don't need a bag suspension method.
The point is, if you already have the equipment to do extract, the only thing additional needed for all grain is a suitable bag. If you want to add more equipment, have the budget, space, etc., just like to tinker, whatever, then there is nothing wrong with starting AG with three vessel.
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Of course its all grain. you know what i meant.
i dont own a pulley or ladder and id bet most people dont own one.
The benefit i see is just that, less equipment. The process imo isnt any easier. it seems like it has its own challenges and i think biab is the best route not for ease but for cost.