[tiledjinn]

ECS is an architecture proposed by the same group that has said "if you know you're not going to use that memory again, just allocate over it". For certain domains, this is a superior solution to management than more costly cleanup. Re-initializing an allocator and leaving behind old data in now uninitialized memory is a lot faster than doing anything with that memory.

For type safety, entities define mapping of types [components are types]. The whole point of ECS is effectively managing types and ensuring correctly typed data is operated on.