As a full volume BIABer I see the Braumeister as one step up, due to the recirculating feature and the programmability if that's a word :lol: If I had a spare four grand or so I'd actually get one. For those who were around the forum at that time, BIAB actually arose from the BM in the sense that "hey this single vessel system actually looks like it works, I wonder if we could build something similar at home". I would regard the Sabco as being possibly just a step sideways, not upwards.
With the exception of HERMS and RIMS, most 3 vessel systems are based on traditional mash tun brewing. When all grain home brewing became popular from the 1970s onwards the holy grail was to shrink a commercial brewery into your garage. Commercial breweries used the HLT -> mash tun -> lauter tun sometimes -> kettle system because that was the
only way at that time to brew enough beer to keep a village or a small town supplied. As home brewers we don't actually need to follow that technology because we aren't brewing hectolitres. So we are comparatively flexible and can do weird things like removing the grain from the wort (BM and BIAB) as opposed to removing the wort from the grain. This "thinking outside the box" solution only became the bleeding obvious a few short years ago.
To me, the Sabco and other one-level or three on the tree style breweries, whilst making good beer no doubt, are still trying to emulate: