Local CI is very important to quickly solve failed runs. The problem is that we need a ton of logic in the coordinator. For example on how to do matrix builds.

Local CI is very important to quickly solve failed runs. The problem is that we need a ton of logic in the coordinator. For example on how to do matrix builds. For local builds to be perfectly similar we would have to recreate that logic inside the runner. This is hard, not in the least because it are different programming languages.