Do they come too often? This is something that was tuned pretty intensively during pre-release, because I didn't want it taking 5+ years to get to endgame content. But the quests are quite frequent. It's a tricky balance.
I think this is precisely where a setting would be helpful. So people can tune things to what they want. What is appropriate is after all a bit subjective. And such settings in Rimworld are usually story tellers. Storytellers also already regulate some of the event frequency through their difficulty I think. So you could have higher difficulty = more royalty events
Then you'd need something to differentiate "Richard Royal" from the classic storytellers. IMO when royal quests start appearing would be good here. People who want to experience the new content right away can choose him. But if people play Cassandra or Randy they get a more classic experience where the empire only contacts you later on. And they'd get the new mechanoids for example without dealing with all the other stuff right away.
Though an issue I can see right away is that the other settings for the storyteller would have to be based on one of the classic ones. So Richard Royal would probably be mostly Casssandra, but you can't have Phoebie or Randy + maximum royal content that way. So maybe a separate setting would be better