The issue I’ve run across is the passive aggressive approach (aka what some people often mean re:tact) can delay having the direct conversation and then people spend the next 6 months noodling around hypotheticals until the original objector is worn down and says fine - and then the project fails because sure enough, it didn’t actually work. Seen it at least twice.

Also seen the ‘actually it was fine, the objector was just in a bad mood and couldn’t see past their own prior experience and was being a pain in the ass’ more times than I can count.

Which is why hopefully you have senior leadership that can see through the BS and get things moving in a workable direction.