Is the Sony a7 III still worth buying in 2025?

Mainstream reviewers and r/SonyAlpha threads broadly agree the a7 III still produces excellent stills and holds up for casual video, but it's clearly showing its age against the a7 IV and a7 V on autofocus, EVF resolution, and the single SD card slot. It makes sense as a used or discounted buy, less so at full price when the a7 IV exists.