Whether ECS is complex or not depends a lot on which one you use. I've heard the same thing from a lot of gamedevs that use DOTS, but people in general seem to

Whether ECS is complex or not depends a lot on which one you use. I've heard the same thing from a lot of gamedevs that use DOTS, but people in general seem to be pretty happy using Entitas (also a C# ECS that can be used with Unity), Bevy (which is based entirely on ECS) or for that matter Flecs.