I wish cheap serial-port managed switches were a thing. The reasonably cheap managed switches often expose the management interface on all ports, even all VLA

I wish cheap serial-port managed switches were a thing. The reasonably cheap managed switches often expose the management interface on all ports, even all VLANs (with no way turn it off). It’s frustrating that this is just a software limitation - the hardware is damn capable of much more. Hell, I’d love to have a switch where the management interface was an I2C port that I could plug into just for reprogramming. Really just want dumb VLANs, no fancy RSTP or such.