Stamina Meters are Trash
This is the first game I have ever played with a stamina meter and I hope it bombs terribly because if stamina meters get introduced into other games it will be the single worst development in video game history.
Why any video game company would not only limit the amount of time you can play their game but also punishingly increase the amount of stamina required to play later levels (50 maps per stamina bar at level 1 but less than 5 maps at the highest levels) is a total affront to video games as a source of entertainment. At least in Clash Royale you can still play but earn little to no rewards.
Frankly Nintendo should be ashamed of themselves, and even though I have "Dan" levels of enthusiasm for their past franchises, if they continue producing games like this I will be perfectly happy with their products being confined to the trash bins of history.