Orion Platform and the meaning of "unlimited" with only 1 Main Polling Engine

We have the Solarwinds Platform installed at our site and currently we only use 1 polling engine.

We are currently monitoring only 2000 elements (1135 interfaces, 261 node, 639 volumes.

When i look at our "License Details" in the Web Console, it shows "unlimited" for many of the categories.

Understanding that a polling engine scales to about 12K elements, how are the unlimited Categories relevant to us?  What does that afford us?

Thank you,