Cayin is using beta tester, but even that is not enough.
You have to consider that having someone able able to write software and/or modify the android OS it's not easy at all, considering that the hardware is different from dap to dap, and very expensive too.
I've never been a big fan of the android OS, starting with the smartphone to the DAP.
I prefer an OS that just play music, i really love the WM1 os but only a company like Sony can invest in a different OS, all the small companies have to come compromise.
When I use the dx200 I go straight to the mango os, I really don't care about Wifi, bluetooth, and streaming music, but this is just me and may be I'm getting old
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I work in automotive, and I'm sure anybody who owned a car has been involve in a recall campaign to fix some defective components, and it's happening more and more since the electronic is increasing, and the necessity of reducing costs.