The problem, in many ways, is that the nature of the primals has changed since 1.0. It seems that in 1.0, they had, in the least, a rudimentary personality. In 2.0, the primals are less entity, and more pure emotion. Ifrit is the rage of the Amal'jaa manifest, only barely capable of intelligent conversation before enraging and attacking. Titan is the over protect father the Kobolds have been praying for, who's only concern is defending the Kobolds regardless of the cost. Garuda is as free and as mad as the Ixal who summon her, and Leviathan is a psychopathic monster who's only real goal appears to be to torture and cause as much pain to as many people as he can get his fins on. Ramuh, the only summoned primal we haven't fought yet, is the only one to show restraint, and that's probably because those that summoned him were not overall aggressive to begin with. And he may only seem intelligent because we havn't met him yet, and the Sylph we talk to are giving him too much credit.

Also of note is that the Primals of 2.0 aren't even born with much knowledge. Titan, Garuda, and Leviathan just do their thing. Ifrit, the primal who has the most interaction with you, speaks of what he was told by the Amal'jaa, not of anything he intrinsically knows.

The primals could, in many ways, be viewed as blank slates that the summoners fill when the summon them. Once their fully formed in the world, they go about the business of fulfilling the goals they were summoned for, on the most basic level rather then on any real design.