The game is a game of chance, of course by tracking I will know the game [1] is like this and the game [2] is like this, sometimes we often bet on games that make us lose and vice versa make a profit, By considering the game it will make us think about what is good and bad, in essence, yes, we have to track it.
Actually, that's the purpose of tagging as FAVORITE in slot games. Aside from remembering the name of the game, we can sort out what slots should only be played by us as of course we will not tagged as FAVORITE those slot games that we have bad results of playing.
Some bettors are just randomly picking a slot game and if luck comes on that game they will be carried away with the winnings and might forget the name of the slot game they recently played with. They will now check it on betting history and upon knowing the name of that slot they will now find it on the game list and will tag it as FAVORITE for easy access in future playing.