Speed is one thing, what needs a lot of experience in turn. I see that from a smaller scale: If I use a small bit because the pattern needs it that can break if you adjust the speed too high. Can happen of course atr the larger scale of the pro too, so to figure out what bit with what material needs / accepts what speed needs some experience, what will use up time and raw material (costs). But since the larger machine usually is needed to carve larger pieces very fine structures that need small / thin bits are rather not to be expected. One might expect to produce furniture with the Xcarve what usually need fewer cuts, and sell for a higher price than smaller parts. That makes it more productive.
And: you can work “paralllely”: the XRarve pro can carve, and you do the assembling / finishing at the same time instead doing one after the other. (btw: the vacuum part keeps the work space much more clean , brooming / vacuuming less also means time!!!). The CNC-Router can be used to do things that otherwise had do be done manualy, like serial holes, carving pockets etc.
I just made some stools and small tables, the legs can be attached completely differently than usually. Means: new technology: stick and glue legs into the pockets, and done, no holes, no screws, no angles (no metal at all), hence new look, what again may sell nicely.
So I think it is not just about the speed (too of course) but also precision, repeatability (produce serial products), add productivity to the wood shop, and add new (more productive) technology.
The XCarve Pro is therefore not necessarily something for the hobby carpenter who sells some nice items on farmers’ markets but will fit in nicely into a professional wood shop.
the small XCarve did show its use in professions like sign makers etc too of course.