Have you ever played any other MMOs?
RNG is in every MMO on the market some just hide it better then others
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If you think fishing in this game is "hard" you should try XI, were you could fish mob that oneshotted you, if you were unlucky. No to mention you had to travler to dangerous places often.
Compared to it, FFXIV is a picnic.
There is nothing to brag about when RNG rolls in your favor. You are not more "skilled" or "special" because of game of chance. The reliance on pure chance in many of the grinds means that perseverance has no relevance in acquiring key items in this game.