printers with network ports and need for serial port

[figuerres]

hello new here and wanting to understand why a serial port is needed if the printer has a network interface.
also there is a program that is network port only that i found and i wonder if what it does and what this does might be merged to one app / codebase ?

[https://www.resinator3d.com/](Resinator 3d)

thoughts ?

anyone care to explain the the need for serial port access if the printer has network access ?

thanks!