So I gave the new Axe-Edit and Dyna-Cabs a spin. Found some small bugs in Axe-Edit (reported on FAS forums) but mostly it worked well.
The Dyna-cabs themselves sound fantastic! I can't also overstate how big a workflow improvement this is because I was able to try out different cabs with the same mic settings very quickly to find out things I liked and then fine tune those just by dragging the mic controls around a bit. If the "Authentic" tab for Amp block was the "make it easy for users", then Dyna-cabs does the same for the cabs.
If you ask me, Fractal should throw out the legacy IR banks and replace them with Dyna-cabs, use the storage saved for something else - like more Dyna-cabs! Make the old factory IRs downloadable files for those who need them.