Again, it is important for consistency. What you're saying is that you can get the same results regardless of mash temp. I'll ask again, repeat one of the two brews you've made on this system, only put your grain in the freezer overnight and mash them while they're cold. I'm confident your beer will be different.
There's some good discussion happening here with relevant contributions from a variety of folks, but a new thread might be beneficial to poll a larger audience that doesn't have emotional ties to their purchase and consequently feel a need to defend it. Sometimes emotions can get in the way of logic.
Maybe start one in the BIAB forum as that's essentially what the GF is? Several of us have recirculating eBIAB systems that are functionally the same.
BTW, for some reason this discussion reminds me of Dan Ariely's book Predictably Irrational. We are all irrational, but predictably so.
Some very good comments and advice from Tex and I couldn't agree more. I've been following this thread for quite some time and the owners of this system have formed an almost cult following and are very invested emotionally. Maybe they should have named it "ibrew" instead?? Relax. just kidding...
The grain bed temp issue that has been raised is an important one. There is a reason we mash at specific targeted temps but no need to turn this into a brew science discussion. There have been other important issues raised that have been glossed over or dismissed as some take it as criticizing the GF which is not the case.
Everybody please give the GF idol a nice deep bow, then get back to the thing that brings us all to this forum. Good beer and good brewing practices.