PCB are designed with things on top of them. Typically they are mounted with the bottom of the PCB at the bottom of a case. So following normal conventions there wouldn’t be a place for the bottom screw to go into something. Unless you used a bespoke case. It’s much easier to have the two screw design place the screws above the PCB.
It may seem like a minor change, but it costs substantial more in design time and effort. New folded steel cases and injection moulded cases would have to be developed. Designers would use a different port, or worse deploy their own two horizontal screw design. There would then be several two screw designs (metric/imperial/very close/very far etc).
Anyone with the niche need of the two screw vertical design would likely rotate the whole connector or use a flex cable to join the connector to the main board.
PCB are designed with things on top of them. Typically they are mounted with the bottom of the PCB at the bottom of a case. So following normal conventions there wouldn’t be a place for the bottom screw to go into something. Unless you used a bespoke case. It’s much easier to have the two screw design place the screws above the PCB.
It may seem like a minor change, but it costs substantial more in design time and effort. New folded steel cases and injection moulded cases would have to be developed. Designers would use a different port, or worse deploy their own two horizontal screw design. There would then be several two screw designs (metric/imperial/very close/very far etc).
Anyone with the niche need of the two screw vertical design would likely rotate the whole connector or use a flex cable to join the connector to the main board.