I upgraded to Photoshop 21.1.3 yesterday to get the new ACR (version 12.2.1.417) just to try out the new ISO dependent preset feature. I saw the Julieanne Kost post back in February and was mildly interested. The feature allows assigning default noise reduction (and other settings) during import based on ISO.
About 3 hours later, after a lot of hacking xml code with Notepad, I got it working. What a Hoot! As an old, former programmer, I actually enjoy hacking code. But I can't imagine how the non technical users will deal with this.
Help from Adobe is sketchy at best, but I found an excellent blog post that explains it very well.
https://geraldbakker.nl/tutorials-actions/how-to-set-raw-defaults.htmlThe author spends a lot of time bashing Adobe, which they deserve, but then gives you everything you need to know. I spend a lot of time now shooting with auto ISO, so I get values across the full range. Having default noise reduction, and maybe sharpening, is handy. I'm curious why this has received so little attention since the release in February.