I get why people new to the unit would like a factory preset to match the latest and greatest, but it’s a bit of a futile quest. They’re not going to sound “perfect” or “ideal” - they’re not even going to sound the same as they do to the creator, taking into account different monitoring, guitars, style, fingers, humidity, atmospheric spice count, etc.
So there’s really not a huge amount of value in updating them for every new firmware, regardless of the stupendous amount of work involved, since you would still have to tweak them anyway (not even mentioning gift of tone!)
They’re there to be a demo, starting point, inspiration, etc, and the fact that they were designed by some true legends is something to be appreciated. They are pretty much gig-ready with a few personal adjustments. Most devices’ presets are utter crap thrown in by an overworked techie as an afterthought.
I guess new users who might be overwhelmed might like a plug-and-play solution to get jamming before fully learning the unit, but even as they are, the existing presets already do this job to an outstanding degree.