It’s like they all realise that to be in with a chance of winning they need to stay in their couple without too much drama, which makes it boring imo.
I think they are all there to win not find love, presumably for money and fame (eg like Molly and Tom) and I would guess that none are completely genuine.
That’s also why there’s minimal snogging and flirting outside of couples.
Obviously the producers want Luca and Grace to win otherwise she’d have been dumped when single. And they timed Grace to come in when they announced Luca as favourite boy making her gravitate to him.
It would be interesting to see how much manipulation and direction is done by the producers, eg do they tell them who to snog, tell them who to talk to and what to say. It always feels so fake and set up and I wish it was more natural like the older series. Grace especially is very controlled and contained and feels very inauthentic.