One potential issue is tracking. By sharing caches across websites it becomes possible to use timing attacks to track different users. This is why browsers are

One potential issue is tracking. By sharing caches across websites it becomes possible to use timing attacks to track different users. This is why browsers are working to isolate caches per site: https://developer.chrome.com/blog/http-cache-partitioning https://developer.chrome.com/blog/http-cache-partitioning