i did a 3 gallon brew/mash in a bag brew session today. it was awesome. it was a simple pale ale with amarillo and centennial. i had a lot of fun and all my numbers were right on target. i actually was a point over on OG and hit 69% efficiency. i feel pretty good about the brew day as a whole. very simple. very easy.
i picked small b/miab for a couple of reasons. 1, i really like the idea of brewing more often and refining/experimenting. 2, i wanted a little quicker brew day. 3, i wanted to keep things easy and fun.
not saying i won't build a mash tun at some point, but for me right now, this type of brewing is amazing!
i can't thank you all enough for the answers, insight and information you have provided here. it is invaluable for any brewer!