Eh, I've seen it cut both ways (as someone who GMs 90% of the time).
Had a player I was friends with, and roommates for a while, who was a huge 'spotlight hog'. Since some players are quieter and less assertive, I try to make sure each player gets at least one 'spotlight moment' each arc. And this player was real bad for always kinda muscling into other player's 'moments'.
After having multiple talks, eventually just had to kick him (cause he didn't stop), which has pretty awkward considering 'roommate'.
So I'd take players that need to be coaxed into RP over players that have main character syndrome any day (though, of course, ideally all the players just RP readily but politely).