Extra work? OK, sure, but is there a downside?
I did them so long ago, I can't remember what the airplane was. The goal was to drive a much larger surface than my servos had the power to drive. The first time I saw a monster IMAC with 3 servos in each wing the light went on. Heck, that airplane had more cost in the servos than my entire 60 size Extra cost for everything. Funny thing, talking to the owner gave me the impression he was proud of the expense and wouldn't think of doing any differently. And of course, he also didn't build.
But not having to tune grouped servos, and the increased exposure to failures....... yeah, silly me, that wouldn't matter either.