>8K at jumbo TV size has relatively large pixels compared to an 8K desktop monitor. It’s easier to manufacture.
I don't think that's true.
I've been using a 8k 55" TV as my main monitor for years now. It was available for sub-800 USD before all such tv's vanished from the market. Smaller pixels were not more expensive even then, the 55"s were the cheapest.
4k monitors can be had for sub-200 usd, selling 4x the area of the same panel should be at most 4x that price. And it was, years ago.
So they were clearly not complicated or expensive to manufacture - but there was no compelling reason for having 8k on a TV so they didn't sell. However, there IS a compelling reason to have 8K on a desktop monitor!
That such monitors sell for 8000 usd+ is IMO a very unfortunate situation caused by a weird incompetence in market segmentation by the monitor makers.
I firmly believe that they could sell 100x as many if they cut the price to 1/10th, which they clearly could do. The market that never appeared for tv's is present among the world's knowledge workers, for sure.