There is a fantastic GDC video about Blizzard's use of ECS in Overwatch and how it made it far easier to understand the system due to all of the interacting subsystems.
It's funny because a few years ago I read about how the developers of a game from the same studio -- specifically StarCraft -- ran into the exact same problems I did when trying to write a game in the then-common "bag of subclassed game objects framework" in the 90s. To this day I thank the gods that I chose ECS for my latest game because it has made changes, bugfixes, and extensions of functionality so much easier. To say nothing of more data-driven.