Yes, because the proof definitely isn't there that summoner beats red mage in all levels of play. That summoner is clearly the winner over black mage in many statics due to ease of use, res, and the damage is good enough for the dps caster to not matter. That there's nearly double the amount of summoners in savage compared to red mage, and more than triple of black mage is more than enough proof. We have proof, we just can't mention the forbidden site else we get banned for it despite being the only way to have data on how to play the game, and how others play the game.
A summoner has a stranglehold on caster role because they simply do everything too well and they have the best utility in the game: a battle res. They're the best caster prog class by a mile and deal far too much damage with how easy they are to play. If the damage between red mage and summoner was swapped, they would still perform more, and better on average? Why? The class is too simple and too effective in what it does. If people want the class to be so simple, they need to lose the battle res. Unless SE makes the job harder (they won't), then it is the only way to balance it even though people will lose their minds over it.
