Re the activity - Did Phabricator import events like adding and removing of blocking tasks? I am pretty sure that not and that it is why you "see no activity". Cf. T4007: [DO NOT USE] Tracking bug [superseded by #Tracking] and eg. time of creation of various tracking bugs such as this one. This was quite busy tracking bug in Bugzilla.
Planning work? Why not? If you are eg. CSS expert, you want to focus on all CSS related tasks, sort them by priority and either use the Workboard for kanban or narrower sorting.
Sure you can search for "CSS" to find CSS related tracks but you won't find all of them since some don't contain it. Bugzilla knew search as well and tracking bugs were still created.
Most of the tracking bugs are very useful and thus turning them into either tags, projects, goals, milestones etc. is the right path. Of course some may be less important nowadays and deserve probably simple closing but it is not the case of this one. Since there is no whiteboard and no keywords here unlike in Bugzilla, using tags for grouping tasks of the same type is the only way.
That's a good enough argument for me, indeed. Thanks! :)
Sure you can search for "CSS" to find CSS related tracks but you won't find all of them since some don't contain it.
Same problem if noone adds the project to CSS related tasks. (Which is neither an argument pro or con, just par and hence pointing out - creating projects has maintenance costs and someone needs to do the triaging.)
I was reluctant with that one, but yes you have a valid point.