No, you couldn't cut Vaan from the game and expect it to play out the same. Vaan's development is crucial because it directly affects Ashes development. If he was unable to overcome his own desire for revenge, he would not have been able to help Ashe overcome hers.
Tidus on the otherhand could easily be removed from FFX with zero consequences. Should he have not existed, Auron would still have guarded Yuna following his promise to Braska. He would still have lead them off the track to train against harder foes, he would still of witheld information from them so it could have a bigger emotional impact when the party found out, and he would still have given his warcry and lead the party against Yunalesca. Auron blames Yunalesca for the death of his two best friends, and after failing to get his revenge once before and being killed for his troubles, he comes back with a team of powerful guardians and tells them now is the time to fight... his plan from the beginning. Tidus doesn't change any of this.
The laughing scene is a million times worse than the "I'm Basch Fon Ronsenburg" scene. I can only assume you're trolling when you say such things.
Vaan gets exactly one outburst (when he's confronted by the man he believes to be his brothers murderer), he matures pretty fast after that, as a result of learning of the horrors in the world and being an active part in trying to free Dalmasca from the Empire. Tidus keeps up his tantrum throwing for most of the game and he almost never has a reason like Vaan does for his one and only outburst.
If you want to hate on Vaan, i hope you'll be mature enough to talk about it in detail, unless you just hate him because he has painted abs, in which case i'd just be wasting my time talking to you.





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