why bottom navigation bar material 3 has no option to set duration for indicator expation animation
here is the navigation item is screenshot from the source code of it:

here is the inner of that function which is for animation set:

as u can see that harcoded no option by user pefered
the problem is that default duration is too fast if i see material 3 guidelines that not as fast like this jetpack compose

That's a good point. I'm currently exploring ways to implement a “customizable layer” on top of Compose Material Design components, where specific parts could be overridden and customized for a more tailored look.
I'm still in the early stages of exploration, but I've already built a custom Navigation Bar as a proof of concept. You can check it out here on GitHub and let me know your thoughts on the idea: https://github.com/yveskalume/open-material