Very solid observations. I think partly this is a commentary from Bunn on the drawbacks of total mental intimacy. Claremont emphasized the romantic element of the rapport, while Bunn seems to be focusing on the practical impacts of constantly having someone in your head. For me though this is more than just the rapport, it's also when\how it happened.
Originally Scott and Jean had been a couple for some time already and there trust level was high when Jean established their rapport. Tyke and Jeen are nowhere near the same level and furthermore, given how their adult counterparts marriage ends, Jeen has reasons to mistrustful of Tyke that her adult counterpart never did. Jeen may know that Tyke isn't the person that cheated on her but she also knows he has the capacity to become that person. It puts a very different spin on Jott than what Claremont developed in the 60's\70's\80's. DPS and later Jott was functionally a romantic fairy-tale, but this version is much more grounded in the practicalities of both what they know of their future and the fact that circumstances have changed so much. I think that does a lot to decrease the "fairy-tale" element from their relationship.
Frankly it's all very, very complicated now. I can honestly see why Tyke and Jeen might look at BloodStorm and Jimmy and think, maybe those options are a whole lot simpler. Also BloodStorm is hot. I still have hope these crazy kids can work it out but it will not be the same, or even very similar to what their adult counterparts had. I suppose in the end that's a good thing but it's a bit sad to see it deconstructed this way.