Here's the way I look at it - budget and time are the same resource. Both are opportunity costs. You could've spent that money differently and you could've spent that time differently.
So, the question is which is more important - meeting your OV (opportunity-value) budget or delivering something that works? Well, it doesn't matter if the the OV budget is met if it doesn't work. If it does work, then it doesn't matter if you blew your OV budget because you have a working product that will start to generate additional OV.
Now, there is an argument about time-to-market, but that is just a modifier to your product's expected OV generation. Essentialy, either it works or it doesn't. You can't be somewhat pregnant.
Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.