When I bought my "temporary" DSLR as a replacement for the one I'd been using for 6 years at that point, the majority (or at least a decent proportion) still used AA/LR6 batteries, such as the one I bought. Although slightly inconvenient in having to carry a box of batteries out to any event I attended, at least I can replace them near-instantaneously and I don't have to do any prior planning beforehand. Plus battery life from 4 batteries wasn't that bad; provided you're not shooting every second, it'll last a good hour or two.
When I looked for a full-time replacement camera in late 2019, about 18 months later, I was dismayed to find only 2 cameras out of about 50 on the market supported AAs, with almost every other camera having moved to a proprietary chargeable unit. Then the coof happened, I didn't go anywhere, and high-end cameras, SLRs, bridge cameras, and DSLRs powered by AAs are GONE. The only cameras left that support normal batteries are point-and-shoot compacts. Everything else is all powered by Li-Ion batteries, and a good chunk of them don't ship with spares, which you'd need if you want to cover an event without worrying about running out of juice, maybe even two for something that lasts a whole weekend. And you have to charge these both before and after using, which means you need somewhere to charge them in private so no-one steals them.
I just want a professional camera that takes standard batteries goddamnit.