I don't know if the consecutive days streak was ever part of the Android app, but it was part of the iPad app until last spring. I have concentrated in reporting operational problems under Report a Problem at the top of this page, but perhaps I will eventually send a request for restoring this in the apps.

In the meantime, I suggest that you do this by selecting Report a Problem at the top of this page, to the right of the center, and then choosing the option to suggest a feature.