At the moment breaking a monolithic app into modules has little benefit, but is theoretically a beneficial practice to take advantage of future Angular features. I'm speculating but my guess would be some sort of lazy-loading system will be implemented.

I can't find the exact article I read where the authors discussed this, but I did find a presentation by Brian Ford[1] that touches on the subject.

[1]https://docs.google.com/presentation/d/1Gv-dvU-yy6WY7SiNJ9QR...