E2E and onion routing are potentially problematic -- if they aren't compromised by the government. When controlled by the government, they can lull the targets of government surveillance into a false sense of security. For instance, the government-run Anom[0] network that was completely compromised, but claimed E2E encryption. I wouldn't exactly call it a dagger through the heart of government sigint activity.

0 - https://www.pcmag.com/news/fbi-sold-criminals-fake-encrypted...