Optimizing endpoint security with Microsoft Defender for Endpoint's flexible licensing options

This is a little confusing. Above in the 'Please note' section, first bullet point states: This feature applies only to client endpoints. All Windows Server / Linux devices should have relevant Defender for Server Plan 2 licenses and capabilities. Tagging Windows Server / Linux devices won’t change their subscription state.

The example/reference that continues shows Microsoft Defender for Servers Plan 1 and Microsoft Defender for Servers Plan 2. Is this for illustration purposes?

Article also states that Mixed-mode settings apply to client endpoints only - https://learn.microsoft.com/en-us/defender-endpoint/defender-endpoint-subscription-settings?view=o365-worldwide&tabs=mixed.

The other confusion I see with all customers is the way the table and rows with each plan does the count for licenses in that mode.
I found myself coming back here each time I am working with these scenarios while helping organizations understand how this works.