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What's the point of mobile games? Quick, easy to pick up and play time wasters that are on phones--devices that nearly everyone has these days. There's numerous games on mobile phones that exist and are fun, especially for those that aren't "hardcore" gamers, and even a few titles that do cater to dedicated fans of certain game series.
Minecraft PE, Crossy Road, Clash of Clans, Plants Vs Zombies, Threes, and Candy Crush are all good mobile games for kids or casual adults, looking to to play a quick game. Your comparison to the Nintendo Switch doesn't make much sense when these are two different markets. No one wants to cart around a Nintendo Switch, turn it on, load up a game, and play 5 minutes before having to turn it off, put it away, and save your progress, in the same time it takes to clear a few levels of these mobile games. Breath of the Wild is a great game, and arguably better than the previously listed games, but if I've got 10 minutes to spare on a commute or waiting for something, I'm not going to play it then. I'd much rather play something quick and easy to turn off. That's the beauty of mobile games.
Fire Emblem Heroes is the perfect game for me, because the game allows me to do pretty much anything I need to, in a 5 minute timeslot. No Switch game really has that going for it. You don't need a controller, you just need yourself and your phone, and you can exit out of the app at any time, shove your phone in your pocket, and nothing of value is ever really lost for doing so. By the time I've loaded up Odyssey and taken five steps, it's already time to get going, and nothing was achieved by playing the game.
Mobile games have their niche, and though very few of them can compete with the level of console quality gaming, that was never really their goal.