[rcfox]

Not everything can live on the stack.

If you're not using new/delete in C++, you're probably not doing something very complicated. (And hey, that's not necessarily a bad thing!)

[netheril96]

The resource manager (like std::vector or std::unique_ptr) can certainly live on the stack when the data it manages resides on the heap.

[saynsedit]

RAII can wrap heap-allocated data. Also bss-allocated objects are common.