Chosing Relay or SSR for LEDs

I was just noting that the resistor isn't required for the MOSFET example logic level mosfet switch to work switching an LED.

Not sure I understand that either. While one doesn't need a gate resistor using a mosfet (although many recommend a small one) there is still a need for a series resistor in the led/drain circuit to limit led current when the mosfet is full on.