Why do we need work managers if the self-tuning pool is not limited ?

Hi all,
AFAIK, the self-tuning thread pool in WLS 10.3 is not limited in size, meaning it can grow indefinitely.
On the other hand, work managers only make sense when there's a shortage in resources, and we need to decide what are the priorities to get a thread and CPU time.
So if, for example, I have a system that's only 20% busy even on the heaviest load, the work managers will never "kick in" actually, since there's "enough for everyone".
Thanks for sharing your thoughts!

If you have more than a single application deployed and only have the default work manager, all apps compete equally and are also equally unable to be tuned in their thread usage.
If you instead have a unique work manager for each app, you can limit each app's consumption of resources - if needed - or alter each work manager's treatment / tolerance of hogging threads. For instance, an app that maintains sockets versus a webapp.
Having separate workmanagers allows you to tune the apps individually. If needed.

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