The numbers are completely made up. Jr developer 2.5 vs 1.0 while "regular" is 1.0 and 1.0? The more senior the bigger the work. It's the same across both, worst case.

0.75 to 0.75? Rework from review is also much faster. Now you don't have to tell a peer to rework a bit here and there for obvious reasons and spend time on a new loop. The review process isn't atomic.

Our production pipeline is faster across our very large organization, after implementing AI processes.

> Tickets contain about 5x as much meaningless junk as they used to

This is a process problem. Developers should be able to answer questions about their PRs, or you reject it. It's not a daunting blanket issue.