Because, I set it up like this and cook dinner. Then I go to another and set the table. Then I go to another and do some work or something. I spent almost none of that time actually playing the game, but I'm still farming FATEs. This means that during the time spent actually in front of the computer I can do other things (or farm FATEs more intensely if that's what I want to use my game time on)
@Welsper59
The problem for me with the Atma system is that I get my enjoyment in FFXIV from cooperative gameplay. I actually do enjoy doing FATEs (and certainly enjoy downing coil or doing dungeons with a random party) when it's just a few new players in a zone since it feels like an accomplishment, but swarming them in our relics does not. For me, raiding is about the group downing something, not about the RNG reward at the end (and this is why I like the Myth/Sol system and love the Sands of Time and Unidentified Tomestones, non-RNG based rewards for the entire group eventually comes just from doing the content. Farming it is missing the point in my opinion). Back in in the day this might have meant waking that Dragon that can only be killed once on your server until somebody resets it or camping that monster that spawns once every x-hours while in FFXIV it's much less brutal (and in my opinion much better if you happen to have a life), but ultimately there is enjoyment outside of rolling the dice on gear.
FATE party members come and go too quickly for a sense of group accomplishment (if anything, there is only resentment when somebody gets an Atma), FATEs themselves are mindless content, there is no lore whatsoever why a killer of gods is killing a bunch of monkeys in order to get this crystallized whatever, and during busy server times there is almost no social interaction within the party as FATEs are constantly popping. To me it effectively sounds like you're arguing that FATE grinding is ok despite the lack of any merit to the actual content because RNG makes it effectively akin to pulling the lever on a slot machine where our time sunk is so great that we're stuck just like a gambler that's just converted their rent money into tokens. I suppose some people do get a thrill out of gambling, but I personally don't see how this could ever be considered good.