Thank you Mark and Congratulations for MVP 2020.

I didn't know that ServiceNow recommends doing that.

 I was told by my peers that when a upgrade happens it excludes upgrades for UI actions which are customized.

Im curious to know, what happens if I have to revert back to OOB button which is excluded in last upgrade.
Is there a way that we can upgrade a single UI action instead of whole instance?

 Please let me know!!