Greetings. Done a few flights with the 757 now, and very surprised to not hear an aural alert when approaching selected altitude. Having been on 767 flight decks on a number of occasions I have always heard this before. Is this a purposeful omission or am I missing something?

It's purposeful. It's a customer option in real life and Captain Sim have chosen not to model it guess.

I find that slightly odd as specific operator options like this are generally available for on/off selection in premium products, but thank you for your insight nonetheless.