[FooBarWidget]

Reference counting is not deterministic. Whenever a refcount is lowered to 0, you don't know how many subsequent references exist further up the chain that will also be lowered to 0. Lowering a refcount to 0 can result in an arbitrary amount of code to be executed depending on the references.

If you mean that reference counting, on average, tends to result in fewer amounts of random/unpredictable pauses than most GCs, then I agree.

[z92]

I guess on that scale and probability, no code is deterministic.