Some yes, others friends’, and Dr Bonkers who sells IRs that are well off the beaten track has said he intends to sell captures and I’d imagine some of his will be somewhat esoteric.
So in general your point about there being a good range of options available from Fractal and Line 6 is true. But to give you a specific example, Line 6 has an EH185 model for the Helix. And it sounds absolutely unlike the real amp. Not even close. The sound of a laminated archtop with a single coil pickup through that amp has a particular sound signature and response and that’s what I’m looking for.
And doubtless there are people who come close to emulating that amp using a Fractal but personally I’m not interested in investigating all the different amp topologies, capacitors, etc, to try and get an approximation. It would really be much simpler to get a capture and see if it satisfies my criteria.
So that’s my rationale and I’m sticking to
But as is said, the proof of the pudding is in the eating. So only time will tell.