I mean, its econ/business lingo.

Its not an argument, its just a description of what is happening.

Weak demand pretty much means 'less people are buying this thing'.

Its a pretty well known phenomenon that if you raise prices too high, or all your customers become broke in some other way, have their purchasing power diminished... that's referred to as 'demand destruction'.

You could also destroy demand if you maybe worsen the quality of the thing you're selling, but keep the price the same or even raise it.

(cough AAA video games cough)

But, but... I will give you that this kind of phrasing does sound, to the average person, as if it is grammatically obscuring what's going on, or shifting the blame to consumers.

A lot of business/econ lingo is subtly insidious in that way.

Fair point there.

Why buy a mobo if you can't afford the components to make it useful?

Even if it is 10 bucks for a top-of-the-line mobo, people would not buy since new CPU is sold at hefty price, and GPUs, even used ones, are way overpriced to be needing new motherboard.

What is the point of getting new hardware when old hardware (say, 10yo) does well in today's standards while new hardware cost you an arm and a leg?

Can't even by HDD, not even SSD, with today's prices.

Who cares if a MSRP$199 motherboard now costs $239 instead of the $249 it did last month? RAM is still thousands of dollars. GPUs are still thousands of dollars.

There is no point trying to build a PC anymore. Run what you have until the industry collapses, and only spend any money on indie games. The industry has chosen to fuck you over completely. Never forget that.