pragmatically, costs. to do it right you need to promise the data isn't leaving, so you'd need to deploy your own stack (costly but not too much). you're explicitly replacing 'people' which left or right probably don't have much support for and people already are incensed when they hear about Musk/Trump, now bring in Machines taking Jobs.

it could happen in the next 4 years, i wouldn't write it off. but all cabinet members need to bring themselves up to speed. trump appears to be moving quickly but it's because he spent 2+ years thinking up everything he's doing. i doubt cabinet picks spent similar time - they probably weren't even sure he'd pick them.