This is the tradeoff: "if you are willing to invest your time, mental energy, and vigilance into bending your device to your will, avoiding traps such as mention in the article, and doing upkeep, a Linux-based device will give you enormous and awesome capabilities, leveraging the full power of having a general-purpose computer in your pocket."
I am glad that that's available, because for some people, that's a great tradeoff! But it's important that there be another tradeoff available, which iOS is currently the flagship of: "if you are willing to accept more limited capabilities, you can have those capabilities in a form that Just Works and does not require your vigilance, time, and mental energy."
I propose that the market share of Android and iOS roughly reflect the number of people for whom each of these tradeoffs, is the one they want. Of course we may want different things at different times - but when we buy these devices, we are voting with our dollars as to which tradeoff, overall, serves us best. I hope that both retain vigorous market share, because different people are best served by different tradeoffs.