You misinterpreted what i said. Ren and Natsume had more screentime together than Satsuki and Yuzu did (or it felt like it to me, anyways) but I personally found Ren and Natsume's relationship way less satisfying. I actually wanted to see more of Yuzu and Satsuki together while I felt indifferent to Ren and Natsume.
The main issue with Ren and Natsume to me was that Natsume never really felt like a proper character. She was pretty much noting more than a satellite character to Ren and that ruined it for me. It did not feel like Natsume had anything at stake in the relationship at all so I didn't have much of a reason to care.
Satsuki and Yuzu's characters were way better defined than Natsume's and more importantly, I actually knew what stakes they had in their relationship. Yuzu's innocence helped Satsuki see Konohanatei as a home instead of a speed bump and helped ease her uptight personality while Satsuki's experience allowed Yuzu to adapt to her new life. Their relationship clearly got stronger over the series.I don't really see the same thing in Ren and Natsume because like I said, Natsume barely even registered as a character for me. That level of characterization is fine if she had as much screentime as Kiri and Sakura, but she had way more.