tl;dr: Where possible, use "DIS" instead of field override services.

I hadn't really gotten to or had a need to explore Workday's Data Initialization Service (DIS) feature as a replacement until we had an integration with 50k+ employees to scan and 40 field overrides.

• Without DIS: Integration events bombed after 6 hours of run time with, "The integration encountered an error which prevented it obtaining the list of workers with data changes."
• With DIS, the same integration event ran in under 20 minutes.

So, yup, use DIS!

Community has a few DIS related posts:

• What's New: Data Initialization Service for Custom Integrations
• Concept: Data Initialization Service (DIS)