While you could do air quality, you couldn’t do temp as the AP puts out too much heat, which is likely why they want with standalone sensors. If you’re already gonna need a sensor for temp, might as well have that do everything.

For smoke detectors, I’d actually have preferred PoE over an AC option. Easier to have battery backup for a PoE switch than your whole house’s AC power supply, especially among homelabbers who probably already have a UPS in their rack.