This is a head scratcher from FiiO. A drop in battery capacity and no advance in the aging operating system. Do we really need more output power in a portable device? The M11 series have more than enough power for most high quality headphones. I suspect this model will be a dud for FiiO. A definite pass for me. No compelling reason to upgrade from my M11S.
This kind of desktop-like amplification power is most welcome to those who have harder to drive headphones or earbuds, but who don't want to purchase desktop DACs and amps. Instead, they simply want a "one device does it all" system.
Fiio will be updating this and other series DAP's to Android 12.