Near as I can guess, the idea is that the code is optimized for what browsers can do and gpus/servers/crawlers/etc can't do as easily (or relatively as easily,

Near as I can guess, the idea is that the code is optimized for what browsers can do and gpus/servers/crawlers/etc can't do as easily (or relatively as easily, just taking up the whole server for a bit might a big cost). Indeed it seems like only a matter of time before something like that would be broken.