For me, it's hard to think in terms of dealbreaker. Each session is a global experience and I do not have a checklist of what must or not be done to appreciate the overall experience. The reason that a single massage can be as pleasant as a FS. This being said:
Kissing - What disappoints me is the limitation... LFK only makes me uncomfortable. I respect the limit, but it is difficult for me to understand.
BBBJ - BJ is somehow mandatory. CBJ is ok, but I would prefer BBBJ for sure. My first meeting with an SP, I was refusing BBBJ and she refused CBJ. I still have in memory the vision of my cock in her hand, next to her opened mouth, her greedy eyes, begging for it. My God, I was a stupid!
DATY - The reason why I prefer 90 minutes sessions! Taking the time to taste her, explore her and try to make her cum is SO exciting!