The hardest to replace, is social interraction Because the simple idea of spending the rest of your days (roughly 40 years...), alone, on the equivalent of a forgotten planet... Isn't an healthy one, even for a monk You might start losing your mind and pondering suicide real quick in that, factually pointless, situation It's a pointless life, even amish have each others, even monks have each others, even inmates have social interraction, even those in solitary confinement for the rest of their days see at least the face of a guard sometimes https://en.wikipedia.org/wiki/Thomas_Silverstein You'll tell me at least you'll breath fresh air and are free to to take a walk when you want, as opposed to silverstein, but you get the idea The lone monk (because it's that)... Not everybody can go through that path, very few people can without losing their mind at some point, imo ... Now if you have the network and a machine... You can replace that artificially, like we do now, this is somehow a social interraction, the internet It's viable, it's not necessarily ideal, but it's viable, depends of people of course, some just can't live like that they need mundane shit, cinema, night club, restaurants etc That, is what you'll miss the most, your interraction with the world, the literal sense of your life, unless you go full alchemist or some shit trying to find the devil or whatever but that's simply insane lol ... Problem with the network is that it pings your position...