I'm definitely not going to argue that you need ECS to do much of anything, but ECS has come long way in the past 4 years from a tool that lets you have lots of

I'm definitely not going to argue that you need ECS to do much of anything, but ECS has come long way in the past 4 years from a tool that lets you have lots of entities in a game, to a more generic system for entity management. Things like entity relationships (https://ajmmertens.medium.com/building-games-in-ecs-with-entity-relationships-657275ba2c6c https://ajmmertens.medium.com/building-games-in-ecs-with-ent...) introduced features that were already common in existing entity management systems, such as entity hierarchies. An ECS can also come with a bunch of tools for inspecting entities, monitoring performance or changing components in realtime (https://www.flecs.dev/explorer/ https://www.flecs.dev/explorer/). Definitely not something you need to complete a game, but very handy.