This statement simply isn't correct. I can procure much faster chips as a consumer, even at the low end. This isn't the fastest single board computer either, not by a long shot. Like I said in another comment, it's only about as fast as a 2010 Macbook Pro. That's not "very fast" by any metric.

I'm using a Core i3-N305 based single-board computer (Odroid H4) for my Plex server and it performs easily twice as well at just 3W more - while being x86 and fully compatible with any relevant OS without having to modify boot loaders and drivers or worry about incompatibilities. Reducing its power draw to the 12W of this chip would still easily outperform the Rockchip and would allow for a smaller heat sink. Best of all, MSRP is nearly the same compared to the CM3588 with the RK3588 (admittedly without RAM). You'd have to do something to the rear IO to make it slim enough for use in a laptop project, but that's trivial on a project like this.