Got asked about this twice so I’m cut/pasting my answer, but happy to discuss further

Check out the dora reports and the data Nicole Forsgren lays out in her book Accelerate. DORA reborts are free to access. She has found clear links between trunk based (no branching) development and a whole host of positive metrics. There is some suggestion that PRs are not too bad if always done at high quality and within the same day, but its weaker.