Savin is generally not a fan of pregnancy content. Especially content where he writes NPC getting pregnant. He is a sort that likes more the idea where player carries his NPCs children. Which is why Arona only got her own pregnancy content a long after her sire one for one.
So this is more of him just not being on the same page with most of the player base than any kind of malicious intent. And I think same will ring true with Atugia and Azy if I remember right. Which is fine, but I do wish game had more direct way in telling you that "No, this character will not be able to get pregnant". To not leave players disappointed since that is what a lot of them came for.
As for me, marrying Cait is least of my priorities. Not really into open relationships in these kinds of games when I have characters like Brienne and Kiyoko that are more monogamous in nature. But I am not really into putting down those that are. This game is made to appeal to many different sorts after all.
Do hope that male marriage options get expanded on. Brint is to similar in terms of content compared to Cait for my liking. And him being considered players bull (especially if his harem thing comes true) is just not for me and being a sub. So I always choose Brienne. And I see Quin as a friend and not really a lover. Male Cait basically.
Which leaves me with Berwyn. And, while I like Berry, him being only guy that I am interested in and in future being able to marry just does not sit well with me.
Well, I guess there is Takahiro but I am not all that excited for being his second wife/concubine. Do not like feeling like second fiddle. I am not really afraid for female choices tho. With stuff like Einin, Ahmir and mino cowgirls on horizon, I will feed good on that front.
So yeah. basically give me at least 2 more male marriages to my liking and I will be happy. Liulfr for example looks like a good candidate.