One example of a half forgotten project is something called Google Classrooms - for teachers and students.
It is missing so many basic features.
For example there is no way to automatically take attendance when students log in.
You can hack around it but for a project aimed at teachers it shouldn't be so painful.
While I am ranting: I am still thankful(/s) to Google for abandoning Google Hangouts integration with Youtube live streaming.
This forced me onto OBS full time and is actually a good thing.
EDIT: I speculate that this frequent failure of integrating between various Google properties must be because there is a strong silo effect by now at Google just like any other big corporation.