[hackerfromthefu]

There are techniques to allow large teams to work on monoliths together. They take planning and discipline, but overall I would say are far more reliable than microservice explosions for similar sized systems, because the earlier you manage the integration the less work it is. ie what you pay at source integration time is less than what you pay dealing with deployments, infrastructure and especially support across distributed systems which can get real expensive real fast.

I've worked on multiple systems with around 50 developers contributing fulltime to them, very practically.