I agree, I think Ryan Murphy is a good man and would be a nice partner for someone. If Strike wasn't around, or completely unavailable/uninterested, I think Robin would probably be quite happy with Ryan - the main reason that they aren't working out is because her heart isn't in it.
If you look at the trajectory of their relationship throughout all the books, they meet each other, they are surprised by each other (Strike thinks Robin is just a temp and then is thrown off when she's actually useful, Robin thinks Strike is a grumpy/rude bastard but she is intrigued by the case and can't help herself getting caught up in it, and through this she comes to appreciate his skill and insight, and then grows fond of him as a person).
I honestly think that Robin is mostly excited by the detective work and process and the success of the agency, shared progression towards a shared goal - she does have feelings for Strike, but it's all caught up in their partnership in this specific work, and the fact that they make a good team. I think if she'd met him in any other context, if they didn't work together, she wouldn't be attracted to him. She's attracted to their partnership rather than being attracted to him as a person, although she is fond of/attached to him as a person now. Whereas Strike immediately noted that Robin was hot (and then tried not to because he was being respectful of her boundaries, which I like) and then he also noticed all the various things that make her competent which makes him like her even more. But I think he'd appreciate these things about her even if he knew her in a totally different context, and for him getting to work with her is a glorious asset (but anyone competent could fill that space and he would still, separately, be attracted to Robin) whereas Robin is attracted to their partnership. Which, honestly, I think isn't a bad basis for a relationship at all - I can recognise it in my own relationship, and I think it's a really good basis for marriage, because rather than seeing "Me, my life" and then that joining on to someone who has their own life which is linked with yours, you see it more as "Us, our life, our goals" - I think that's a far more fulfilling relationship for Robin. And while Ryan ticks a lot of the boxes - detective, handsome, good in bed, good listener, respectful - he lacks that one crucial part. I think if Robin did leave the agency and join the police instead, she could well get together with a co-worker there and have the same kind of fulfilling partnership relationship.
And they both had obstacles which had to leave before they could really look at each other otherwise it wouldn't work - Strike needed that final, permanent cut off from Charlotte, painful as it was, and Robin needed to have some other relationship experience other than Matthew. So it makes sense that both of these things had to happen first, and this was a clear setting up in this book so that they both have a totally clear slate - of course Robin still needs to actually end the relationship, but I think Strike is right and it won't be long until she does. That relationship was never meant to be permanent, it was meant to be a palate cleanser after Matthew. After you've been in an unhealthy relationship, especially one that started very young, it's really really useful to have experience of something healthy where boundaries are respected and you can be yourself, even if it's not quite right for you. She needed to do that with someone that isn't Strike before she could go into a relationship with Strike, otherwise she would still have had baggage which would have got in the way I think. I hope they do break up amicably and there is a happy ever after result for Ryan, because he does seem nice and genuine.
Good point about changing Switch's name - that would make sense, it's a terrible name XD especially with the Nintendo Switch console out - imagine being called "Playstation"!
I really really didn't want Bijou to be having Strike's baby but now I don't know! I'm sure that's just a teaser for us all to ponder about and I really can't tell if it's a total red herring or whether it's going to be a theme of the next book.