Yes, I know that there's no reason a high CRI LED can't be a neutral white, though I haven't had reason to dig into it. Every high powered light that I've had or been interested in in the past 3-4 years have had Cree XM-L2s. I'm haven't followed or investigated why they are the most popular, but it is what it is. Since I'm a consumer, not a light maker, I don't have much of a choice. Sure, I'd like to see high CRI neutral white lights, and if they available for the lights that I'm interested in the future, I'll buy, but I'm not dissatisfied with what I have or what is available.
I not motivated to dig into it much, so I ask, do you know off hand if those Nichias are close enough in specs to be interchangeable with the XM-L2? For instance if I want to do an LED swap, would they work and have the same dimensions so they would focus the same with the same optics? Or does the design need to be adjusted?