[TelegramApp]

MTProto still uses RSA, AES + DH. So I would disagree that what we have here means 'compromising security for speed and stability'. It is rather optimizing for speed and stability, while staying secure.

[ska]

Often in the crypto world, these are exactly the good intentions with which the road to hell(pwnage?) is paved.

Knowing this, I hope you can appreciate why the burden of proof on your unproven team and approach is fairly high.