When I built my basement induction (2 burners) brewery it was 3v for 10 gal batches. things slowed and I went to 5 gal and the 15 gal Coleman extreme MLT didn't have a deep enough grain bed to work. I got a bag and made a pulley set up and make step mash brews using the HLT to add boiling liquor.
Yesterday I made my spring beer, a rye double bock that hit 1.095. Because the grain bill was 23 lbs I could use the 3v system and sparge and get higher efficiency. I did a single infusion at 152* for 30 min then pulled half the grain for a decoction added back for mashout at 172*.
I started at 11:00 am and finished making the wort at 7:00 pm. It will finish chilling overnite to 55* and I'll pitch and clean up this morning. So yeah Bobby it was a long day and I got one more session for a RIS going in a barrel at 12% or so. I also make a Quad and a Tripple every now and then,so you might say I go both ways. I also have a 10 gal aluminum pot and a propane burner I take on the road for gypsy brewing.