Has Lego discontinued presenting alternate configurations on the backs of modern boxes?
I don't have enough reputation to post a comment, but in response to this comment by user3509 (and the similar answer from MartenFerret):

I would also hazard a guess that for brand sets part of the deal was that alternate models weren't allowed for copyright reasons - for example, a Star Wars X-Wing set can only build an X-Wing. Lego then probably made all sets follow the same design pattern for their own brand cohesion.

The original 7140 X-Wing model released in 1999 did have the traditional alternate builds shown on the back of the box:

So if it's a licensing-based decision, it was a later one.