It seems to me that the issue here is still finding an IR that sounds the way you want it to sound.
The current efforts of Ownhammer and Fractal to provide mix-ready IRs seems to me to be the first step in providing us all with better sounding, more useful, IRs as opposed to the Red Wires paradigm of simply providing us with raw IRs taken at various mic positions with various mics in the hopes that we'll find a mic and mic position that works for us within ALL those IRs.
I.e. In creating the OH and Fractal mix IRs these guys have just said, "OK, let's just find some mic positions and combinations that sound the way we'd want it to sound if we were recording these cabs in a good studio."
And within the current OH and Fractal IR packages this philosophy was even carried through with the IRs of the individual mics.
I.e. Rather than providing us with innumerable IRs of each mic at innumerable positions, most of which are clearly useless, the OH and Fractal guys have decided to just give one or two mic positions of each mic that simply sound good.
In my experience mic'ing my own cabs with a single mic, usually a 57, there really is only 1 maybe 2 positions that actually sound musically useful.
So both these companies IMO are definitely on the right track.
But their current focus has been in providing well mic'd studio techniques.
I believe that if they actually turned their attention towards trying to also provide IRs that attempt to capture something of the amp-in-the-room ambience that they probably could succeed to some degree.
This would probably involve using room mics and back of cab mics placed in strategic positions mixed in with some more typical close mic positions.
I also find it a bit odd, based on pics of the mic'ing process on the Axe WIKI, that on cabswith more than one driver they usually only mic one of those drivers.
It doesn't seem to me to be the best way to try to capture the sound of the entire cab.
Etc.
The "current wisdom" is that the amp-in-the-room feel can NOT be captured within an IR played back through a good FRFR monitor, but I still believe that this remains to be seen because hardly anyone has really tried to do it yet.
I used to think that all those TC-30 close mic IRs would just magically translate the actual sound and response of a cab w/o any colouring into my FRFR speakers.
But that was never even close to being the case.
Now that I have a bit more experience with the whole FRFR paradigm I think I understand a bit better why that is so.
And not to totally dis the RW IR collections....
The solution to this type of thing might well be lurking within those IR libraries because they almost always include some ambient IRs captures of the room and/or the back of the cab.
So some enterprising guys out there might indeed be able to craft their own IR mixes, using Cab Lab or sim, that actually come much closer to the stated goal than any simple single IR that's out there at the moment.
But these guys will have to really know what they're doing and/or get really lucky.
So I'd really like to hear what OH and Fractal could do if they really turned their attention towards trying to more closely capture the amp-in-the-room feel in their IRs with their sophisticated mic'ing techniques, in the sophisticated studios they have at their disposal, with the sophisticated mics and outboard gear they have access to, etc.
I bet they could come a lot closer than the "current wisdom" says they should be able to.
It may never be 'all there' but I bet they could get a lot closer if they actually tried.