Why are textures blurry in Assassin's Creed Shadows at 4K resolution?

Sneaking through Kyoto streets, distant building textures looked like smeared oil paintings, which was fatal at 4K. I tried lowering texture quality from High to Medium; while loading speed improved, the loss of detail was unacceptable and left me feeling helpless. I used the GamePP Resource Scheduler to set the game priority to Realtime and restricted background apps. RTSS showed VRAM throughput increased to 210-230GB/s, AIDA64 confirmed core temperatures at 68-74℃, and HWiNFO monitored fan speeds at 1800 RPM for stability.