I don't entirely disagree.
However I will say that my 2003 Olympus E-1 continues to work perfectly (and both batteries and storage cards are still available easily), and most of the digital cameras I've purchased, used, then sold on to the next user over the past twenty years continue to be completely functional with available storage cards and batteries. More importantly, plug in an appropriate cable and connect them to my computer, via ports that weren't even available when they were new, and the data on their storage cards is immediately accessible/downloadable/whatever.
My own view is that digital camera things like batteries, storage cards/formats, etc, have sorted themselves out over the past 20 years to work pretty well now. There weren't many consumer-priced digital cameras prior to that worth the cost, so the history is short and has been fast moving, but I suspect we've hit something of a plateau that will last for a good time.
G