Although, one interesting aspect of the trade-off here is that a programmer who manually monomorphizes only has to do so once(^) -- their effort is reused acros

Although, one interesting aspect of the trade-off here is that a programmer who manually monomorphizes only has to do so once(^) -- their effort is reused across multiple compilation runs -- whereas the compiler normally has to monomorphize on each compilation run. (^) Of course, you then have the burden of keeping multiple monomorphized implementations consistent when you make a change that needs to apply to all of them.