Also the DNG spec does continue to be iterated on, not that users will be forced into the latest features like jpeg-xl compression, but some of the changes can be very breaking to older apps.
If you're a freelancer using v2 and someone gives you v3 files, you can't work.
For it to be a problem you need to actually buy said new cameras and lenses.
I am still using my Pentax K5 II and Samsung NX from a bit more than a decade ago (as well as some analog cams but I disgress).
There is a lot of FOMO + Gear Aquisition Syndrome to make that a problem. Maybe one should focus more on actually having a life,using the products they akready own, make arts or memories instead of thinking what is new on the market they are missing out and what to buy next.
Makes me think of those people, perfectly happy with Airpod pro v2 who purchase v3 ones, only to end up frustrated by their new purchase.