Spoiler Alert
Except it WON'T be cut-and-dried without the twist. The finale already had more than enough to make good TV. Another idol played which Ben found right next to the spot he was being interviewed. A new and exciting final immunity challenge with everyone being so close to winning. Right now it just feels like "Hey, since we can't plant another idol in the final 4., let's throw in another twist to give our golden boy another chance in case he doesn't win the FIC."
Like you said, it's a great final 4. It's not like we would have a Michele type of winner if Ben didn't win, which is why they didn't need to interfere any further to make good TV which is obviously the one thing the production cares about the most. In fact, it would make better TV if Ben loses because of a mistake, bows out gracefully as a fighter for his family and comes back for a second chance season.
Survivor is a social game essentially. 9 idols and several advantages in a season is overkill whether or not it's exciting to watch. Yes we may have boring seasons and winners if they don't throw in a million twists. But it's the crappy ones that make the good seasons stand out imo.
But at least they have a PTSD vet as a winner. I guess everyone is happy for Christmas!