Okay well, I was going to disagree with you because I thought you were talking dungeons. Then I realized you are talking about primals.

There really isn't any excuse to loading into a primal fight blind. Either do it with your FC, if you have one, or check the wiki / other sites on google to learn what to do and expect for each phase of the fight. Primals are a big deal, and briefing yourself only takes a minute or two.