I think that's an insightful and succinct way to say it.
You might theoretically create structures that resonate at some UHF or SHF frequency. Seed a search engine with "PCB trace antennas" and look at some of the shapes - they resemble patterns you might find on any circuit board. In practice, that's one reason you make liberal use of bypass capacitors; and most commonplace devices don't respond well at those frequencies. (But frequency response is getting closer to daylight with each passing year.)
And that is why you connect pads to fill zones using thermal reliefs, with minimal spoke widths and antipads of 20, 30 or even 40 mil clearance.
Board fabricators usually like to see large fill zones. It reduces the amount of chemicals needed to etch away copper, as well as the disposal problem.