I worked there in 2010s and almost nobody was utilizing it anymore since general incentives were not aligned: it was hard to cut out time from your main project

I worked there in 2010s and almost nobody was utilizing it anymore since general incentives were not aligned: it was hard to cut out time from your main project, and on top of the you had to pre-justify your 20% project as useful, which is for 20% project often more work than the project itself.