If only there was some sort of device that could automate the conversion process, perhaps to the extent that humans never have to worry about any friction on their level at all.
Either that or you keep all your coins sitting in said exchange so you can instantaneously convert them and pay out. And then lose them all permanently when the exchange has a security flaw.
Currency of the future.
Why can't people (on this site of all places) spend just a little bit of time thinking about how things could work well instead of merely pointing out problems?