This is certainly true, but I think Timber Dragon's original post was already implying this. She was saying that subpar players will often overlevel their Pokémon to compensate for their lack of skill, which Reborn's level cap puts a stop to. If you create a well-balanced team, give them decent movesets, and play smart, then the level cap will hardly be an issue.
In other words, the level cap in Pokémon Reborn does not exist to make the experience harder, but to encourage players to up their game.