I felt exactly the same way and thus built
Thing1. Would I do it again now that Brewzilla 65 is available ? I don't know. I'd have to see. I welded up the stand and started building the electronics for Thing1 2 years ago. It was a no brainer to finish it FWIW, I started out with the intent to build a big 3V system.
I definitely love the advantages of the all in one. I used to dread brewday because of being outside, propane, all the work, constant watching, etc. But with an all in one, it is relatively painless. So easy, in fact, that I now look forward to brewday. And it allows brewing to fit in with family life.
I couldn't bring myself to go with the Grainfather because of its many little pitfalls - mainly not enough power and pump issues, but also the limited capacity and price, actually. Then Robobrew came along and Mash and Boil. Hmmm... still too small. So I built Thing1. But now Brewzilla is here. It will be very interesting to see how the market responds.
I find Brewzilla to be kind of an odd size. How many kitchen brewers need capacity to brew 10 gallon (finished) batches ? I guess that won't matter if it still does a good job of doing 5 gallon batches. What Robobrew and the Grainfather needed was slightly more capacity, way more heat power and a better pump. Brewzilla finally fixed the power issue but the pump seems to be the same. So that is still an issue.
I'd love to buy a Brewzilla without the pump and even controller. I'd add a TDS5 pump and replace the controller with CraftBeerPi. And put it on a stand. That would be the ultimate all in one brewing system, short of Thing1, of course.
I'm very surprised that Grainfather hasn't responded with an upgraded version that addresses the heating power and pump. I guess they have enough market share to be complacent. Kudos to the powers that be for bringing out Brewzilla.
If Brewzilla catches on, I think it basically spells the death of 3 vessel systems. What do they do that Brewzilla won't do ?