I may be missing something, but right now, other than by reading this meta, newcomers won't know they should be tagging their system. We have some suggestions on how to address it (Can our tag-prompt nudge toward including system? - which was sadly deferred because it seems changing it is hard due to how SE works), but as of now, I don't see anywhere (again: I may be missing it) stating how important it is.
So, can we (easily) change the [tour] page? If we can, is there an appropriate place to include the importance of tagging (or at least stating) the system you are playing somewhere?
If we can't, is there anywhere we can easily, accessibly include this information? It keeps to be one of the main reasons I see questions being closed, and I feel we should be able to do better in introducing this concept to new people than having their questions closed, commenting this rule, hoping for their edit and then reopening it.