What showed you this in this release? The motherboards compatibility?

Scripts and packages moving from steamos- to holo-. "holo" is the internal name for the base OS layer. Pulling the product brand out of the plumbing is what you do when the plumbing is going to run somewhere the brand doesn't apply.

Version jumps - Kernel 7.2 while stable SteamOS is on 6.16, and Plasma 6.4.3 straight to 6.7.3 — three desktop releases swallowed at once. The driver (heh) is probably compatibility.

Valve also reversed course on their adoption of iwd (Wifi), and are going back to wpa_supplicant for compatibility with various networks (They ported iwd's fast-resume trick over for parity).

All of the above changes point to maximizing OS compatibility with various devices.