Didn't we just recently get two 1977 shows that just dropped out of sky? We also got a Joad show that wasn't Crystal Catted to death. We got an important finale (Buffalo). We got a remarkable Philly '09 show that closed the Spectrum. I think they are mixing it up just fine.
I agree. They've done a good job with this.
Imagine 20 years ago being told "We are going to get official live show releases, many of them classic vintage performances, every 30 days. "
That said, I think they are overdue for something pre-1975.