This is still a common practice. The point of it isn't to evaluate employees by # of hours worked; the point is for their manager to have a good understanding of how time is being used, so they can make suggestions about what to go deeper on, what to skip, how to reprioritize tasks, etc.
Several employees simply opt out from this because they prefer not to do it. It's an optional practice for the benefit of employees rather than a required practice used for performance assessment.
What are things that previous Research Analysts have struggled with at Open Phil? What are reasons others have found it not to be a good fit?
A few things that come to mind:
The work is challenging, and not everyone is able to perform at a high enough level to see the career progression they want.
The culture tends toward direct communication. People are expected to be open with criticism, both of people they manage and of people who manage them. This can be uncomfortable for some people (though we try hard to create a supportive and constructive context).
The work is often solitary, consisting of reading/writing/analysis and one-on-one checkins rather than large-group collaboration. It's possible that this will change for some roles in the future (e.g. it's possible that we'll want more large-group collaboration as our cause prioritization team grows), but we're not sure of that.