There are plenty of monitors out there that support high resolution analogue inputs
That does mean nothing. As stated above handling high resolutions at input stage is useless when the panel can not display the resolution. What's the point in feeding your monitor with pixels you never can see? (Okay you see part of them washed out - aliased but....)
I always post with current available and affordable hardware in mind. It does not make much sense for me to talk about 10 years old or even older professional tube displays which were capable to display 1920x1200 (Not more than that. I do not know a single tube which can handle more. If you know one I bet no one here does have such still working today. The average user did not even know about and never would buy such device priced more than a months salery).
I run it at either 1800 × 1440
It did not make very much sense when you drove your tube with higher resolutions what the tension mask or shadow mask really could display. Your 2028 or 2560 were simply analog down-scaled to what the tube can handle. Although this analog scaling worked smoother than most of todays digital scaling it was
down scaled to 1600 pixel horizontal for 24" 4:3 tubes at best. If you talk about bigger sized tubes used f.i. for air traffic control then that's another story. But I hardly think anyone here needs such (todays) theoretical discussion.
TFT which is what we can use today can be driven of course with analog signals. But the resulting image is
always worse than when digital driven. Usable if you do not have high quality requirements but worse compared to native digital driven.
silly repetition of an old "Tom's Hardware"
I don't know Tom. But I know the inner working of tubes and LCDs and I know whats physical possible to display. I can distinguish between what's technically possible and what's marketing bla bla. High input resolutions much beyond the tube or LCD is capable to display are marketing bla bla. At least for the average computer user these modes are not useful.
Btw. I still do have some Matrox cards with good DACs. But they are useless today as I never will drive f.i. a current available 4k display with analog signals when the whole world drives them digital. I bet if you do not buy a professional monitor (which is out of question for all but the very rich) there analog input and conversion electronics is crappy.