They're still in use. i.e. https://www.digikey.com/en/products/filter/signal-relays-up-to-2-amps/189 https://www.digikey.com/en/products/filter/signal-relays-u

They're still in use. i.e. https://www.digikey.com/en/products/filter/signal-relays-up-to-2-amps/189 https://www.digikey.com/en/products/filter/signal-relays-up-... has 811 hits. According to the datasheets: Typical applications Industrial sewing/stitching machines, fitness, elevators, pumps, robotics, solar panels