In contrast, I see a lot of use for DX systems, and that is justification enough for me. The Z fc hasn't been dumbed down too much by Nikon so is pleasant to use and fits my smallish hands like a glove too. I even use the Z30 which is dumber, but still useable. With suitable lenses to match these small cameras, they are easy to deploy whenever a bigger system would be a hassle. And I don't reserve DX for 'birds and bugs', either.
The above relates to Z/DX, since I seldomly use F-based systems these days.