Some people really really like the iPods but from a pure technical perspective. The FiiO DAPs will have better audio circuitry than what your iPod have.
#2: Maybe, no one can tell except those that have that exact config
#3: No, contact FiiO and ask for it and have them test it and whitelist it.
No. You can sideload apps (by installing APK) on the whitelist, you can not install app APKs not on the whitelist, it will deny you. Now if you are asking about sideloading by hacking it and gaining access through Fastboot and load the app there?....dunno lol
Do you guys not have phones!?
Fair enough. The interface and physical buttons are not my favorite either. I can't hold the M9 naturally, I have to do a soft claw grip or else i risk depressing the buttons on the side.
It is taxing. You have to understand there is a reason audio purist DAPs do not have screens. There is a lot of processing involved in terms of system level interrupts, general priority, niceness level (Linux high level priority), and other aspects of this operating system that they need to leave enough resources for. With a touchscreen DAP running Android, you put yourself at a con audio wise as any movement or interaction could cause lag that causes stuttering or inability to assure SQ throughput as Android is not fully optomized for sound.
Add in more processes, a browser, and internet HTML5 multimedia elements and this thing will no longer have audio as a priority and audio quality will drop for sure.
Get a poll going, sign a petition sheet, contact FiiO and tell them you want X apps. Ranting here won't get the apps you want approved. It's not rocket science. It's not a great thing but if you want something, tell them directly up front and get some backing for it.
"Even though the processor on the M9 is a watch processor most of the Apps being demanded are not using any processing power the M9 can't handle or would slow it down." Read my above paragraph to handwander. I'm an embedded computer sys engineer and have worked on Linux extensively (what Android runs on). Things are a LOT more demanding than you think they are. They need to leave enough headroom to sustain audio quality or else you'll start getting chops. The processor threads will literally start throwing audio as a low priority is how it usually happens. Someone not familiar with this process might say, why not hack the system and set audio priorities throughout the system configs to be high with a cpu direct niceness level? Because that's how you get a full system freeze up when you start messing with priorities of things that actually need it to kill what is bogging down the cpu.
+1 lol. Deleting apps can 'speed up' a system if it is very bogged down and using crap flash memory like a slow internal NAND flash or SD card that is almost full. But that's the only time and that's due to access times and IOPS.
The Exynos SoC is at its limits of the app already. You don't notice it but there's stuttering inside already and album loading is slow and there are hiccups. They are running at a greater graphical resolution and running a near full version of Android as opposed to say Wear OS or a more cut down version of Android. Only thing its missing is Google Play Store and the stuff FiiO hid to be enabled and you have an Android tablet/device.
The most common Wear OS smartwatches have a resolution of 360x360(129,600 pixels) to 400x400(160,000 pixels). The M9 is 800x480 (384,000 pixels) and has over double the amount of screen it needs to render which is definately something the SoC struggles with.
The Exynos 7270 sports a Mali T720 with a maximum supported resolution of 960x540 but that's a technical maximum of pushing the limits and running Wear OS.
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Guys no. FiiO is not screwing with you here on why it can't whitelist apps. It's literally at its limits. Any more and you will start having audio stuttering which already does happen even with just the FiiO Music App and nothing else running.