When you call the humans who keep production safe “the bottleneck” you’re painting a very specific picture. The reviewer as the obstacle. The gate as friction. Something to route around. Cue in the Balrog scene from Lord of the Rings. That picture determines what you build. The tools to remove reviewers look different from tools to support them.
The bottleneck was human ego and people not actually having enough experience for designing complex systems. Or people without enough experience setting up people systems that interfere with those who can actually design the systems.