The XP-G cant even remotely be lumped together with the XM-L as far as size is concerned. Just look at the 2 side by side, there's no comparison. The XP-G is not a large LED. Its a fraction of the size of an XM-L. Its much closer to the size of an XP-E. Looking at the 2 LED's side by side, the XP-G is only about 25-30% larger, which isnt going to make that big a difference in throw within the same sized reflector, whereas the much larger XM-L will be much more floody. There are several smaller sized lights with XP-G's that throw well, so certainly a P60 sized light with an XP-G isnt going to be really floody.
But I totally agree about the CRI issue. The average drop in brightness between a neutral or cool LED vs. a high CRI LED can be significant, and I dont understand why anyone other than a professional photographer would be super picky about high CRI lights, when a nice neutral white beam is just fine, and doesnt destroy color rendering ability or anything. Maybe its OCD....
I agree that the XML and the XPG are different sizes, and both larger than the XRE.
But if you had been around when the XRE was out, and saw what happened in the transition from XRE to XPG, you'd have a different idea about what "small light that throws well" really means.
If you read the commentary in the CPF archives when the XPG first came out, you'll notice that there is a LOT of talk about "no throw". This is because the manufacturers were putting the new XPG into their hosts which were designed for the XRE, and suddenly, the throw disappeared. In general, when an XPG gets put into a reflector size that threw well with the XRE, the throw gets cut in half.
Of course, with the larger XML, the situation is even worse. And this is why everything with smaller size heads are now floodlights, and the only real throwers have large heads with large reflectors.
Back 'in the day', when the XRE was new, even small lights had really good throw, and the P60 size lights could easily show over 5000 lux, and a Dereelight Javelin with the XRE P60 showed 8000 lux and was the "P60 throw king" .
The old XRE had less efficiency, and had somewhat lower lumen output than the XPG, but it kicked the tar out of the XPG for throw in small(P60 size) flashlights.
And still does. We've just gotten accustomed to the shorter throw from the XPG, and the manufacturers have moved to larger head/reflector sized to accommodate the XPG's requirements for the larger reflector to get throw.
So, I guess that was a long way around to saying in a P60 size reflector, or even in some larger ones, the XRE with the smaller die size will out-throw the larger emitters, even if the XRE produces less overall lumen output, but it will produce more lux in the beam center for more throw.
It's an emitter-relative issue as the emitters got larger.
Ironically, I'm actually a fan of the more floody lights. But I have watched the thrower market as it has gone along, and observed what was going on there. I do like a reasonable amount of throw with my floody beams, and my favorite lights are the Malkoff Wildcats. And they all have XPG in them except the earliest Quad-emitter V1 Wildcat(which has XRE), and I like the XPG in these lights just fine, and they all throw about 150 yards, which is what I prefer for throw distance. In my Elzetta, I use the M60 with the XRE and optic, because it will get out there to the 150-yard mark, but the M61 with the XPG will not. In that case, I accept the tighter beam from the XRE/optic in the M60 for the throw distance, over my normal preference for the floodier result that I'd get from the M61, because the M61 won't throw far enough for me.