I can vouch for this still not really being true even in Apple-land, since almost any peripheral, external disk, printer, whatever, that I'll want to plug in isn't gonna be from Apple.

In 2026 the single most useful port to add to my Macs would be USB-A, with no close competition. On any device with 2+ USB-C ports, it'd easily be worth sacrificing a USB-C to get a USB-A.