> No, before that it was simply not a term, except in some obscure radio protocol

> no one really used the E2EE term before it got the current meaning

It most certainly was a term and no it wasn't simply limited to "some obscure radio protocol".

1994: https://ieeexplore.ieee.org/abstract/document/363791

1984: https://dl.acm.org/doi/pdf/10.1145/357401.357402

1978: https://apps.dtic.mil/sti/tr/pdf/ADA059221.pdf

> Some homemade encryption added on top of TLS is very unlikely to increase the security of the system

"Some homemade encryption" is not what I was suggesting at all. E.g. encrypted-at-the-source (client side) AWS files are still sent over TLS as an encrypted blob within an encrypted blob but remain encrypted past the TLS boundary.