The key thing approval lets you do, in my opinion, is take a plan you mostly like but has one or two things you really don't (recruiting Wasabi over the Glooms, reaching out to Shere Khan rather than the Zaibatsu, not putting TECHNOR on a quest, etc.), and just... change the things you don't like about it. And then also vote for whatever more established plans you prefer, for strategic reasons.
Then, when other voters are looking over their options, they can vote for whichever frontrunner they prefer for strategic reasons, and then also vote for any tweaked versions of the frontrunners that better match their preferences. If a tweaked version is deemed better by enough people, eventually it'll become one of the frontrunning plans itself, and people who voted for it and another mediocre plan can drop their vote for the mediocre plan and allow the tweaked version to win.