AIX

If there was any such thing as ideal limits, the system would be locked into using the ideal limits and there would be no adjustment you could make. That said, a couple of issues do come to mind...

I do not like nproc to be unlimited. If someone does a while(1) fork(); I would like to be able to recover without a reboot.

We are required to justify every instance of core being any value other than 0. This is a security concern. A core file can contain information that should not be exposed. And assuming that the address space is also unlimited core files can consume lots of disk space. When a filesystem runs out of space one of the first things that admins look for are core files. Settings core to zero prevents the problem. Developers often need core files... so be it. But our default state is no core files and then we enable core files where we must.

You should leave the root/superuser account settings as the developers of the operating system intended unless you have very specific requirements that require you to change them.
You should not be running anything as the root user so its configuration shouldn't matter; it is the administration account. Always create a specific accounts to use for any applications you wish to run and set the limits for those users.