It's really ubiquitous in the japanese RPGs and "open" games I happen to play.
Yakuza? Fishing game!
Persona? Fishing game!
Trails in the sky/of Cold Steel? Fishing game!
Nier Automata? Freaking RobotFish Fishing game!
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Also fishing is easy to implement, which counts for a lot.
Yeah. If the player character can stand next to the water with nothing happening you're already 90% of the way there. All you need to do then is add the ability to spawn a fishing rod item for them to hold while they're standing near the water with nothing happening
I just remembered the BEST fishing minigame by far was one I saw this twitch streamer called macaw play. It was an old visual novel type game, and it had this fishing minigame that looked really cheap and bad. But when you caught a fish, this catchy song played, complete with an epic drum fill, and a voice said in english. "Iiiiiiiit's okay!!"
Words do not even do it justice.