On your points:

Manager changes are always going to go through the usual pipeline, we are 10k+ people so there's not even a way to go all gung-ho pushing stuff. They need to be reviewed, approved, etc.

But we don't want our manager to code, nor does our manager, so we are just helping to cross the bare minimum expected from higher ups. For my team it's not an issue with our manager's code (those will be at max small fixes, well-defined, the most trivial stuff), the issue is they are mandating managers to do it.

I don't know what size of company you work at, where I am at there is simply no incentive for me to do all the extra work to show execs/higher management the issues cropping up.

I don't even have access to them, I have to pass through other channels, those might compile reports from many people to try to present a case, if they get to present a case then there's a whole other discussion to happen at director/VP/C-level about what they want to do, and since it goes against their big mandate it most likely will just be thrown out.

In this structure I have no motivation at all to go out of my way to perform data gathering/analysis, wrapping it all in a nice concise document explaining what the data means, potential remediation, etc. just to become a footnote in someone else's document that ultimately will not change anything from the VP/C-level mandate.