This but also: not the managers in the teams that build/"protect" it.
But really, leadership above, echoing your parents.
I just went through this exercise. I had to estimate the entirety of 2026 based on nothing but a title and a very short conversation based on that for a huge suite of products. Of course none of these estimates make any sense in any way. But all of 2026 is gonna be decided on this. Sort of.
Now, if you just let us build shit as it comes up, by competent people - you know, the kind of things that I'd do if you just told me what was important and let me do shit (with both a team and various AI tooling we are allowed to use) then we'd be able to build way more than if you made us estimate and then later commit to it.
It's way different if you make me to commit to building feature X and I have zero idea if and how to make it possible and if you just tell me you need something that solves problem X and I get to figure it out as we go.
Case in point: In my "spare" time (some of which has been made possible by AI tooling) I've achieved more for our product in certain neglected areas than I ever would've achieved with years worth of accumulated arguing for team capacity. All in a few weeks.