We do! I did write a jokingly sarcastic response about how it’s a cunning framing device to make us feel more kindly towards Adalind, then I realised I was right and that’s exactly what it is.
In TV and Film there’s a device called Pat The Dog – if the character pats the dog, the audience sees them as a good person. It’s shorthand, if you will, to give people certain characteristics without them actually having to do anything kind or heroic within the story – usually saving time in the film. Harry Potter has it (talks to the snake at the zoo), the Ninth Doctor has it (cuddles a cat), any small act of kindness that the character didn’t have to do, like give change to a homeless person for example, is a Pat the Dog moment.
It’s not always animal based, it’s often used with babies, as in this case. We see Adalind performing various baby related duties with a smile on her face, the baby seems happy, if a person makes a baby happy they must be a good person.
To show Nick handling Kelly would distract from that at present, but to mention that Nick doesn’t do anything for Kelly would mean that Nick is a bad father. So, the only time you see Kelly on screen is with Adalind* so you feel more kindly towards her without her actually having to do anything kind or selfless to anyone else.
I for one would love to see more of Kelly, especially with Nick. I want to see how he feels towards Kelly, rather than the sense of duty he has towards him. I’d actually like to see more of Adalind and Kelly, beyond pat the dog moments. She has a great fear as well as a great longing for motherhood, but I’m sliding off your point here.
We do need more Nick and Kelly, I would like to know how he plans to raise him – knowing of the Wesen world, or not? And other similar questions. I’m really curious.
(*I know they had a couple of scenes together, but mainly it’s Adalind for the reasons outlined above. My drama training ruining TV shows again.)