[el_bhs]

I don't think that doing manual memory management doubles dev time for experienced devs, no... I just mean that, if you're trying to eliminate GC hiccups by, say, writing a custom allocator in C++ (i.e., exactly what we had to do with this project I was on at Google), it just adds up.

I.e., it's not the manual memory management that's expensive per se, it's that manual memory management opens up optimization paths that, while worthwhile given an appropriately latency-sensitive system, take a long time to walk.