This may actually be one of the dumbest, laziest, most useless pieces of "advice" anyone can possibly give. It casually ignores the fact that there are players who are attached to League, whether because they've invested time, money, relationships or all three into it and want to see if it'll improve in the near future. It makes it easier for Riot to get away with shitty things that are designed to take advantage of the player base's habits and lack of attention, because they're too busy telling other people to "take a break" to even notice. Yeah, there are people who obviously need breaks, but they can damn well decide for themselves if that's the case.
Stop it. You don't make the game's issues go away by "taking breaks." You make them go away by telling Riot what the game's problems are.