But, I think it's time to move on. We have ostree and various
container-delta approaches. We should focus on those — and give DeltaRPMs a
sad, fond farewell.

+1 from me. It will speed up the compose, and I haven't seen a positive impact from deltarpms in a long time. They are rarely available and the saved bandwidth is usually negligible (and reassembling of the rpm is usually quite slow).