Consider replacing Baobab and System Monitor with Usage
Disk Usage Analyzer (baobab) is a useful tool, needed by GNOME Shell for low disk space notifications. System Monitor is good too. But we designed Usage for a reason. The purpose of this issue is to decide whether to remove Baobab and System Monitor from core and replace them with Usage.
The main problem I see with Usage is there's no way to list all processes. That seems... quite insufficient. It's a cleaner design for pinpointing problems, to be sure, but it's not useful enough to show what's running on the system. Even if we consider System Monitor a developer tool rather than a user-focused tool like Usage, the overlap here is so tremendous that I don't think we want to have the two of them in core together. And I suggest that it would be a mistake to add Usage if it can't at least display all running processes.
Previously we had planned to just delay this decision as Usage continues to evolve, but we want to lock down the set of core apps for the foreseeable future, so now's the time to decide.