Hmm, but most of Brienne wholesome scenes are locked behind sexual content, and especially behind pregnancy.Yeah, I like wholesome as well. But I think you two give too little credit for the other companions.
Sure, Ryn is great, I quite like her. But saying she's the only wholesome relationship? Have you never met Brienne my friends? Lady is the embodiment of wholesome from head to toe - or hoof I guess. Sure, I'll grant that she's very horny most of the time, but the sex is passionate and full of love, and she does have gentle tender moments like hugging champ from behind saying Garth might be missing the most attractive patron, and while stargazing together you can say the beautiful night sky is mundane when compared to her. How can you say this is not wholesome?
Even Arona has gentle moments, like when coming home from adventuring you can give your pregnant subazon a foot massage to help her relax, showing you cherish and appreciate her.
Kiyoko has lots of stuff, petting, dinner, bathing, helping with births, family events...
If what you're asking is simply more, then I can only agree. I'd like more for all of them too. But saying what we already have is not wholesome? Nah, that I cannot agree with.
Ryn, in contrast, you can take on dates, casually hug and give teddy bears, Brienne is mostly lovely dovey if you have baby with her or fuck her. Which isn't bad, mind you, but if you ever tried playing a pussy only champ, her wholesome moments are to far between.
Arona is also like that.
Which considering your initial statement of "less sex, more wholesome" feels little out of place. I do agree those are wholesome all the same. But you get why Ryn was really only one that came to mind.