I have a shifter but rarely use it. Never have mastered heal & toe, and although it can be more authentic and fun, I'm never as quick regardless of the car. Besides which there just isn't enough classic h-box content in sims anymore to make learning worthwhile. Used to use it all the time in GT Legends.
You used to get a slight advantage in some cars in R3E (eg DTM 92), because shifting a h-box car with paddles wasn't instant, the sim tried to "simulate" the process of stick shifting. It meant having a physical shifter allowed you to change gears faster than someone on paddles. That was changed a while ago though.