From a cursory scan of the comments, it looks like people are frustrated about not having control over their devices. Right now, iOS and Android control the user, restricting freedom and choices. For example iOS won't let me record my screen while the Netflix application is running. Clearly this is to protect DRM interests, but the principle is that Apple has ultimate control over how my iPhone behaves. I cannot provide a false GPS location to apps. I can't lie about battery level. I can't lie about notification permissions or fool applications. We need to be able to lie to our devices to have freedom and control them.

So back to how this relates to an Android being tied to Google Play: you as the user don't have ultimate control over your device. And that means you don't fully own your device.

That's my perception of the main issues with control from Apple and Google. Lots of great software and hardware being produced, but we need to have more power over the operation of our gadgets.