Why do you not pre-record voice lines for future interactions?
One thing that Heroes of the Storm has done is pre-record specific interactions between heroes, even when one of the heroes is not due for release for over a year. An example would be Alarak's interactions with Deckard Cain (of which, as usual, Alarak is a jerkass).
But League never does this. You could've pre-recorded an interaction for Illaoi with Pyke, but she doesn't have anything special to say to him. Or you could've given pre-recorded a few lines for Lux to say to Zoe, but you didn't do that.
Why is that? Too much work? Too many hiccups in development? Worries about data-miners catching your stuff?