How do you handle other teams wanting to customize a shared instance?

If your org runs one Zendesk/Zoho Desk instance across multiple internal teams (IT, HR, Facilities, etc.) — has a team ever asked you for their own custom views, routing rules, or SLA display, and you had to say no or push back because it risked breaking things for everyone else?

Trying to understand how common/painful this actually is before building anything.

Genuinely curious how you've handled it — workarounds, native features, third-party tools, or just "no.