Living in South Florida I'd prefer a sunroof delete option. I'd actually pay to lose it completely. We almost never open the sunroof shade and it's just another potential spot to leak. Plus that, a lower CofG with no glass up thereAlso a concern.
Once upon a time, Rivian was going to use an electrochromic roof, so that would have provided the best of both scenarios -- light for night use, and dark for day use. Unfortunately, that feature was scrapped (I believe "cost" was the reason given). Since the headliner/roof was never intended to have a shade screen, Rivian had to make a choice. Redesign a bunch of parts, have a normal piece of glass that will basically cook people half the year, or tint the glass so dark that it can handle the sun, but risk making it essentially-opaque at night.
I would have loved to see the electrochromic remain -- even as a paid option. Alternatively, I wish they had put a little more design work to integrate a motorized shade. But actually, I wish they used a more traditional panoramic roof that opens, like almost every other manufacturer.