Goku and Vegeta didn't "want" to fuse versus Buu either. They both crushed the potaras after kid Buu was born because muh fairness, neither could actually deal with him and then they decided to have Vegeta take a beating to buy time for Goku's spirit bomb (detail: both Gotenks and Gohan could solo Buu at this point and they had already been resurrected)
Them wanting to fight "fair" even while getting their individual asses kicked and with the Earth in danger would repeat again and again until the zamasu saga when they fused to fight another fusion opponent, and with the potara retcon the fusion method became little more than an afterthought. In the ToP nobody but Champa thought about using the potara to create a fusion and then the grand minister ruled it out as an exception or some shit, Goku and Vegeta however knew about fusion from the very start but they still cared more about muh fair fights. And then in the Broly movie they spend 1+hour to learn the dance fusion when 1. Goku could have simply IT'd to old kai's planet to borrow a pair of ear rings, or 2. if he couldn't for some reason then Whis should be able to travel there in much less than an hour, too.
TL;DR the post cell saga DB content is a bunch of nonsense with fusion being one of the worst aspects of it.