There’s that, but those touring acts are a tiny portion of the market I would bet.The only reason that I see to use captures would be for a touring guitar played with a particular rig full of great amps, that he/she can't take on the road.
Based on what I’ve seen through the years of using modelers and watching users asking questions, the much much bigger chunk of demand is people who are unsure what a good sound is, and have the impression that if only you’d get a snapshot of Hetfield’s amp you’d sound like Hetfield (or whoever).
There’s a whole industry of making and selling captures, preset packs and all that, somebody is buying all that stuff after all instead of turning a few knobs.
So big artists may do actual capturing, some YouTube influencers may do as well, and while they are a tiny fraction of actual users they move the demand in this direction.

to offer more flexibility

