>E2E encryption is kind of a fucky thing, some suggest it is fundamentally impossible for central web services and even mobile / desktop apps
"some suggest" How about you actually name some competent people who suggest this?
>Basically, if there is a third party involved in the code besides Alice and Bob, the two can never guarantee E2E encryption.
Oh, this is a downright insane, dishonest argument. Perfection is impossible, so we shouldn't even try!
>Anyways, Telegram does seem to have the best encryption of any major service, and it's what we use at my company for almost all internal communications.
Why do you think this? This is such a fundamentally ridiculous claim, I find it absolutely fascinating that someone might arrive at this conclusion.