Summoner is more complex than the Monk because of the little nuances of the job. An average monk can copy the rotation of a highly skilled monk and achieve similar dps. An average summoner can copy the rotation of a highly skilled summoner and see no difference because the way DoT classes work there will still be a 100 dps difference between a highly skilled summoner and an average summoner. If they don't want to go the buff route they can streamline the job by condensing it to two DoTs poison and miasma then give it direct damage spells turning Summoner into an explosive Black Mage.