[ijager]

Just like the RPi, no plated mounting holes for grounding. I am curious if there is a valid reason not to use grounded mounting holes.

It is not easy to pass EMC tests if you want to embed these boards into some device without proper grounding.

[squarefoot]

Is it possible that they might be relying on mounting frames for metal enclosures or wired grounding near the power supply connector, just to avoid ground loops?

[ijager]

Ah I guess. So you would design a custom frame that connects electrically to the connector housing(s).

Might be a good accessory to sell.