Two things I really wish literally any company would ever do with their systems when you have a permissions-based token:

1. Show me all the permissions that that token has been granted but has never used

2. Show me all the permissions that that token has tried to use but does not have

I would gladly accept the ability to turn on an audit mode for a given token, service account, etc., run the thing I'm trying to run, and then go look at the report to see what permissions I can remove - or, even better, have a giant "Create role from this profile" that lets me create a custom set of permissions based on all of the permissions I've used.

Google Cloud does have a thing where it shows you all the service accounts you have with "overly broad permissions", but it seems to be just "here are all the SAs with 'owner' access" so far. It didn't catch the service account we had that just needed to publish one file to one bucket but had been made a Storage Administrator with full read/write/update/delete access to every form of storage in Google Cloud.