With my team, we've recently taken over a large Laravel ecosystem from an incumbent partner. Our client came to us to rescue their project because the business team had lost trust in their developers.
There seems to be a pattern of how large Laravel complex ecosystems got managed and how they scaled over time.
After reviewing the whole process end to end, we identified that it's not always an issue with the developers themselves. It's usually a team failing, with lots of inefficiencies across the whole process end to end.