Yes, and speaking of CI there's also linting and formatting code. In large code bases with certain languages it can take a substantial amount of time to do this

Yes, and speaking of CI there's also linting and formatting code. In large code bases with certain languages it can take a substantial amount of time to do this step (tens of seconds). Being able to zip through linting, formatting, building, running, testing and pushing a binary / Docker image in 1 minute vs 10 minutes is a massive win -- especially when amplified over a number of developers.