It has been poor since SU6 changed the slider to a max of 400.
So it effectively made bing quality 50% when it’s in the middle of the slider at 200.
so in terms of bing data quality:
Pre SU6 TLOD 200 was 100% ZL18-19 quality
If you used the .cfg edit to 400LOD previously u saw no visual change from LOD200 in terms of textures being streamed, neither did 900 improve this.
LOD 200 was the max value to get 100% quality from bing.
now after SU6 TLOD 400 is the 100% ZL18-19 quality and it effectively made LOD200 half the quality.
Simplified :
LOD 400 = previous 200
LOD 200 = previous 100
LOD 50 = previous 25
In terms of ground textures quality being streamed.
Here is the proof.