I still see Central London from Heathrow, but until Asobo improve photogrammetry caching at least I think I'm going to turn it off. Which is a shame because if I set the showcase cam at street level in The Strand and leave it for about 5 minutes to stream all the photogrammetry on my 20MBps connection, I can (just) make out what some of the shops are.
I think I spend nearly as much time looking at POIs with the showcase cam and setting up nice screenshots (sundown with scattered high clouds can give some simply beautiful images) as flying! So perhaps I am wrong to grouch about the quality of the photogrammetry, given higher quality photogrammetry right now would be a total system killer even if you are running a high end CPU and a 3080 and have 150Mbps internet.
I suspect the situation now is simply how FSX was when it launched as you mention. I remember back when FSX launched having a fast PC (and a fuller head of hair ) and expected to be able to turn the sliders right up. Which of course I couldn't! I can on MSFS but that does not take into account the streaming of photogrammetry and it's quality in MSFS. I have a particular interest in the Scottish Highlands and I can say that MSFS out of the box produces much better than I could ever get with FSX and 'photorealistic' scenery add-ons years later. What we will see in 3-5 years from MSFS may well truly astound us. I for one hope so.