Re: Symptomatic of a bigger problem
The "serious work" mantra assumes ARM devices will always be 32-bit, low-clock-speed, low memory machines running purely consumer-centric applications and games on a touch-oriented OS, but all of those factors have already improved, and will only continue to do so. There are already ARM servers in data centres, for example, and "desktop" ARM devices (ChromeOS and Ubuntu).
Moreover, no matter how you personally regard the suitability of ARM devices for certain tasks, which you prioritise higher than others, the fact remains that the market has spoken, and it wants ARM + Android, whether or not you agree with them. Apparently they don't share your priorities, which is why the "desktop" PC market (a euphemism for Windows on x86) is in decline, like it or not.
And even in the interim, while ARM technology is still maturing, it's already more than good enough for the majority of use cases, both at home and at work, which again is exactly why the market has shifted in that direction. If it weren't already good enough, then nobody would be buying it, obviously, so arguing about whether or not you personally think it's good enough is moot.
Eventually ARM (or something similar) will entirely replace the current de facto standard, which will then be relegated to legacy status (if it hasn't done so already). Cling to that if you want to, but personally I'd rather embrace the future.