Novel timing attacks like that are pretty unlikely, basically someone with a 0-day, because otherwise they quickly get patched. If the adversary is someone with

Novel timing attacks like that are pretty unlikely, basically someone with a 0-day, because otherwise they quickly get patched. If the adversary is someone with access to 0-day vulnerabilities, you're pretty screwed in general and it isn't worth a lot of inconvenience to try to prevent something inevitable. And there is no guarantee you can use another network connection. Hotspots only work if there's coverage. Plus, "just use a hotspot or a VPN" assumes you were expecting the problem. This change is going to catch a lot of people out because the first time they realize it exists is during the emergency when they try to remote in.