Hi, according to typical crt_range for 24 khz it seems you can achieve 384 to 400 lines in progressive fashion.
arcade_25
crt_range0 24960-24960, 49.50-65.00, 0.800, 4.000, 3.200, 0.080, 0.200, 1.000, 0, 0, 384, 400, 768, 800
So yes it can be beneficial for some vertical games run on a horizontal monitor.