If your proposal doesn't align with leadership vision or the product they want to grow...

In my experience (I make tools for the network and security guys): that's why you don't propose only one thing. We often have one new project every year, we propose multiple ways to go about it, the leadership ask us to explore 2-3 solutions, we come back with data and propose our preferred solution, the leadership say 'ok' (after a very technical two-hour meeting) and propose minor alterations (or sometimes they want to alter our database design to make it 'closer' to the user experience...)

Well you factor that in too? And be willing to change focus if that's the feedback.

This can still be okay - but you have to be correct in a way that the company values. This of course needs to be without doing something against the rest of the company - either legally or sabotaging some other product are both out. Values is most commonly money, but there are other things the company values at times..