We're seeing a lot more of the Romulans than ever before, but I don't think we're learning much more about them (yet), aside from the Zhat Vash and a hatred of AI. So far, they've been way too human to me in how they talk and act.
In the past, when we got to see the Romulans, it was like Nixon visiting China, in terms of its rareness & otherness. Now they're literally roommates of Picard, and even though I like those characters, there's really nothing "other" about them or any of the other Romulans. And I think it's always great to realize we're all more alike than we'd like to admit, but I'd rather see it in the context of embracing one another's differences & uniqueness.
Part of me is still annoyed by VOY going to so much effort to create a very alien species with Species 8472, only to discover that they were exactly like us. ("In the Flesh") So I was hoping for more with PIC, and there's still plenty of time in the season for things to go deeper.