Contrast this with the Raspberry Pi organization, which has seen massive success by having an uncompromising stance on simplicity and focus, even if the ideological purity of the project isn’t up to certain people’s standards. Like it or not, it’s what made them successful while projects like Pine64 continue to be niche products that require a lot of work and research to use.
And even then, it's only one of the complaints, and this isn't the only places I see backlash against pines treatment of the dev community - again for a company that relies on said community for a lot of software work across their products. My impression is that RPi foundation with Raspian relied a lot less on the community.
But is that really what PINE64 should be trying to do? So far their support hasn't come from the "mass market". It's come from a niche market of open source hackers trying to build and support various Linux distros for mobile devices. Why does improving mass market appeal have to mean alienating your existing supporters?
Not as long as they ship Manjaro as the default OS for their hardware. Rolling-release distributions are not fit for mass-market use.
Also: I've seen some hidden costs of supporting custom OS installs being discussed, i.e. procuring extra chips to allow open boot. This may have factored into Pine64's decision.
That's a false dichotomy, nobody is demanding that users be forced through "custom Linux install" (whatever that means). The problem is also not primarily that Pine64 have chosen a "flagship" distro, but how they and said distro behave towards the other options. I'm sure the quality of the flagship distro is massively improved by making life hard for the project that did useless things like making the camera in the phone work...