Using iCloud storage for multiple photo libraries

Hi all.
I just signed my wife up for iCloud family sharing. We've got the 200 GB tier, and between the two of us that's more than enough. However, I was dismayed to find out that as the principal user I am the only one that can utilize the iCloud Photo Library feature. Considering photos and videos make the bulk of the average iPhone user's storage needs, it is surprising that Apple has chosen not to allow multiple users' photo libraries to be used with the same storage plan.

My question is, has anyone else run into this issue and found a workaround that wouldn't require us to purchase a separate storage plan? A follow-up question: is there any chance that this might be addressed in an update?

Thanks!