We've been discussing REAL ID here on the forum for more than 8 years, because it kept being delayed.
https://community.ricksteves.com/travel-forum/transportation/possible-real-id-act-concerns-for-travellers
I posted this one this time because this time it seems like they really mean it.
There are other concerns beside boarding commercial aircraft or visiting prisoners --
do you want your state of residence to have more personal or even biometric data about you in its records?
The last time California announced that all IDs would henceforth be REAL IDs I intentionally renewed my CDL for the 'old' version so that I could put off getting a REAL ID for as long as possible. As comments above, I'd rather use my passport when needed.
I fully acknowledge how silly it is to worry about sharing your id data with more agencies than is strictly necessary -- it's not as though some cartoonish supervillain or overmedicated con man is ever going to try to share or take advantage of that data in ways that are not in my best interest, after all.
I am considering putting my Global Entry card in my every-day-carry wallet since it serves as an enhanced ID, I think, and the chance of being snatched off the street by unidentified actors claiming state authority seems more plausible recently. And isn't my face red when it turns out that the streets involved are not in Germany at all? I might owe Germany a beer in apology.