That's correct, my metric for performance is throughput
I don't really think a desktop vs a smartphone matters much at this comparison, it's just my observation that when people say a fuse filesystem is slow it's just not well-engineered, not that the fuse API is inherently slow
It matters a lot. You can squeeze impressive performance from a smartphone, too, but then you need to dump all that waste heat somewhere, plus you need to take battery capacity into account. In other words, in a desktop, power efficiency is commendable, but not critical.