[throwaway13337]

It really depends on the direction.

A lot of times, devs want to move in a new direction of whatever the hip tech stack is this year. This would help their career by adding the tech to their resume but the business benefit is almost always net negative.

Rather than arguing with a developer, they might just give a response that is outside of the developers' domain. The real reason is that it was a bad idea for the business.

[mysterydip]

That's a fair point. The perspective of developers is different from that of a manager with perhaps a longer term view or other knowledge than the people in the trenches.