I've certainly had situations where 'fibers' made more sense - a verilog runtime system with literally millions of them (where the compiler can figure out exact

I've certainly had situations where 'fibers' made more sense - a verilog runtime system with literally millions of them (where the compiler can figure out exactly how much space 99% of the fibers need - so stack sizes of 12 bytes, run-time contexts of similar sizes, 10 instruction dispatch times ....)