The author must be very tolerant or otherwise accustomed to lag. He says "no noticeable lag" but is 3G even that good on paper? Wavering pings of 100-1000ms are pretty normal on 3G in my experience, so given a round trip, if the difference is an optimistic 200ms that's should be pretty noticeable when typing, tailing logs or jumping around vim on a remote system versus doing it locally.
I'm sure you can build confidence and get used to pulling off a string of moves with no immediate visual feedback, but it sounds like something you'd have to get used to tolerating, rather than not notice?
Yeah, that has to be horrible. I remember working remotely from Thailand, and had around 150ms to a linode in Japan, and it was infuriating. Even worse when trying to access services at home, with latency around 300ms. With latency over 30ms you start to notice it. There are good tools out there, though. Mosh is one of them.
I'm sure you can build confidence and get used to pulling off a string of moves with no immediate visual feedback, but it sounds like something you'd have to get used to tolerating, rather than not notice?