A bit like with DAP's they had one job to do and failed.
What would that one job be?
Be compatible with every streaming app out that (90% of which need Android to run)?
Therefore, be up to date with every google update?
Be bitperfect, unlike the 99 other smartphones out there that tick the above two boxes--resulting in a hodgepodge of hacks to the system that run counter to the above in almost every case?
Have good volume control design, just like stock Android is purposely designed NOT to do?
Be audiophile-approved, which may involve stripping the device of essential Android services to make it more "pure", adding heaps of audiophile-approved buzzword features to the detriment of actual performance in most cases?
Be audiophile-approved in size, weight and power consumption (large, heavy and hot)?
Be casual-user approved in size, weight and power consumption (small, light and cool / long running)?
Be objectively good sounding (straight wire with gain)?
Be subjectively good sounding to audiophiles (lots of distortion generating devices like tubes, R2R, discrete components, and it's not good enough to just make an elephant dance as well as a ballerina--if it's still straight wire with gain it will sound like everything else and the audiophile will hear through the charade--it must be actually objectively bad to tick this box)?
At the end of the day the market for these things is such a huge mass of contradictions I'm surprised any product produced works at all! They certainly can't possibly work "well" for most people.
Disclaimer: personal opinion.