While I agree that one can build a system for less money, I strongly disagree with the "material handler" comment. If that were true, anyone who has built a system with automation is no longer truly a brewer, nor are many commercial microbreweries. The brewer still controls the recipe, the ingredients, the mash parameters, and everything on the cold side.
The Braumeister makes the realization of the mash schedule easier (time and temperature), provides an excellent brewing system in a small footprint, and makes for easier cleanup due to fewer vessels. Sure, the capacity is limited by the size of the unit, but that is true in any system. It looks to me like in the 20l system one will have to mash to yield a more concentrated wort, then add make-up water. I am unclear as to how large a grain bill will fit in the tube, and I suspect that really high-gravity brews are out, or will yield less than 20l. So your point regarding flexibility is well taken, but due to capacity issues rather than automation or single-vessel design. However, if the OP understands those constraints and is not concerened about them, then more power to him.
Hey, I can prepare beef wellington and spend a good portion of the day doing it, employing a knife, cutting board, food processor, mixing bowl, rolling pin, and roasting pan. But there are also plenty of outstanding dishes I can prepare in a single pan, dutch oven, or crock pot.