The perfect, good, mediocre, and just barely tolerable are all enemies. Sometimes bad is better as it doesn’t erode the motivation to solve the problem and means you’re more likely to end up with a good solution later. Often, when people accuse others of letting the perfect be the enemy of the good, the option was neither perfect nor good, just mediocre or barely tolerable. The exception is when one solution can go on to evolve into a better one, but it can still be better to wait until it does before deploying it.
I’m not convinced this is exactly applicable to the story in the OP, though. The compromise would have eroded the motivation to vote for the original legislation in that election, but probably made it more likely that it could have happened in the next one, and made the consequences of putting it off that long slightly less bad.