I first brewed in 1969 using extract....... the only thing available then. After a few batches the limited supplies available resulted in my abanding brewing for many years. A year and a half ago, I begain brewing again, and went straight to all grain. I use BIAB because it requires almost no equipment, and produces a product that is in no way inferior. Items needed are a brew kettle and a bag... and of course a way to monitor temp. I insulate my brew kettle with egg crate foam after reaching the desired temp. I brewed all grain batch number 95 Saturday.
Biab is not cool.......... but it's simple and cheap, and a good starting place. I originally intended to build a mash tun, but decided I didn't want 3 large tuns to deal with. I brew in the kitchen on the stove doing 2.5 and 3 gallon brews (mostly 3 gallon). More important than the brewing system is having a grain mill, and good accurate scales and thermometers.
I've gravitated to a hybrid system....... I mash in the same kettle I used for BIAB, but without the bag, and since I have another kettle, I just pour my mash into that kettle using a brew bag for a filter........ That brings me up to a two vessel system........ I hose out the first kettle and use it to dunk sparge .... adding another level of complexity. I have my water heater cranked up to "oh wow", so I don't need an HLT.
I'm debating going to a mash tun with a false bottom for a couple of reasons, and I'm also looking at building a reverse circulation mashing system that will start while I'm asleep. I'll probably go with the latter. In my future is an automated brew system using the water heater for an HLT so I can sparge.
The point of all this is that starting simple and cheap, lets you decide which way to go. There are a number of reasons I decided not to go with the cooler mash tun, probably the most important is the "stuck sparge". I use a lot of wheat and rye..... You can squeeze a bag....... You can't squeeze a mash tun. For this reason, I probably will always have brew bags on hand...... if worse comes to worst, I can always dump the grain tube out into the brew bag and squeeze...........
H.W.