I've had the opposite experience with Auri limbal rings, I've been fighting real hard since the first benchmark (almost a year already...) to get my limbal rings back, which were pretty much gone in both benchmarks and 7.0 (except at night), and made a bit of a comeback since 7.1 (even if they're not exactly like before yet, and the dilated pupils are not helping). I'm not saying this to shut down your opinion, just to share that from my perspective, with the character creation choices I made, things have slightly improved. This has also been the case for some Au ra NPCs like Sadu and Allie, who in 7.0 looked very different from how they used to in 6.X.
However, it's far from perfect, and the 7.1 adjustments are much more sensitive to the environment lighting than before, which exacerbates the "high beam" effect you're talking about. That has also affected the appearance of Cirina and Yugiri, whose limbal rings have drastically changed colors after 7.1.
I wrote a
very long debug post on the Japanese thread about how the color and thickness of limbal rings are strongly affected by the lighting (particularly the green and red values, and I'm pretty sure the game's lighting is a lot more yellow than it used to be...), in case you're curious to learn more about why that "high beam" effect is happening.
I hope a middle ground can be found, because I do agree that some color combinations looked better in 7.0, but others sadly didn't, and same in 7.1. I still think that the method of rendering/displaying the limbal ring is what is at fault, and I still struggle to understand why they decided to change it from how it worked in 6.X (like, I think the same gradient transition and glow-in-the-dark effect could be achieved, at the cost of maybe making the ring not perfectly round, but still with more polygons than in 6.X... but I don't know what their technical constraints are, so).
Hopefully we both get what we want in 7.2, but yeah I'm as anxious as you about the changes, even if we disagree on what was better lol