It certainly is very strange! For example, another older route which I've noticed having blurry textures all of a sudden is Dresden-Chemnitz; even more bizarre in the fact that Dresden-Riesa works perfectly without any blurriness despite it being TOD 4 etc. Also, doesn't matter if it's a large, busy route. Smaller, less busy routes like Maintalbahn and Mittenwaldbahn have blurry textures - again how come if these routes aren't necessarily so memory intense?
Dresden Chemnitz had blurred textures occurring right from the start of TSW4, as did any use of the original BR101 loco on any route. That has been my experience on PS5. The issue may have been getting worse but it has seeds from a long time ago. For me it has been mainly an issue on German content and it is all German content now.
I've been trying to totally avoid playing any newer routes in the hope of not experience blurring - MSB, Dresden-Riesa and Vorarlberg work fine and I'll probably return to Rapid Transit and RSN. While some of these are quite outdated, I still very much enjoy them nonetheless - and a bonus with no blurry textures!
Don't even get me started on the ads with Prime. I like to watch Vox Machina and Hazbin Hotel when I'm on the bike at the gym, and cannot stand the randomness of their commercial placements or their lengths. Since those two shows and the Fallout series are the only things I watch on Prime, I'll be damned if I'm paying an extra $5 a month on top of the hundred-something a year I already fork over.