"Oversaturated" is subjective but I feel like he's been in literally everything for the past 5 years including commercials lol, even though I don't watch much TV or movies.
But like many, I didn't even know who he was until GOT and didn't realize he's been grinding in bit parts since the 90's. He probably got tired of other actors stealing everything he's worked for and wasn't surprised MFers when the job offers started rolling in after Mando.
This dude is the Robbie Lawler/Charles Oliveira of acting, and good on him for sticking with it and becoming a star.