Yes it is a lame idea and it is a pretty unfun and monotonous grind.
I'm convinced SEs primary motivation is to infuse high level players into the FATE system to keep it running, so newbies can actually complete them.
However, every DEV worth his salt should implement a failsafe against bad streaks in a progression mandatory RNG grind.
Remember: Not getting Atma breaks the whole relic quest chain, we're not talking about some superfluous mount here.
It could be as simple as a guaranteed drop after 200 Fates in a zone (more than enough time spent) or they could do something more elaborate like Blizzard and gradually ramp up the dropchance after a certain (unknown to prevent exploits) threshold.
But a system like this MUST exist, because after all this is a GAME and precious free time spent MUST be rewarded.
Not instantaneously, mind you, but eventually the player MUST reap the rewards or he will simply ditch the game in frustration (Hint: this is a bad thing).