First of all, note that tags are added based on what the poster of the question specifies. As such, you are not forced to use only the existing tags. However, since this Q&A is mostly community-driven, users with at least 500 reputation have the privilege to retag questions - informally translates to "users who have been here for a while" - in order to adequately assess the category/tag that it should be filed under.
Secondly, 10k-users have access to moderator tools which allow them to see any new tags that have been created within a given time frame (today, last 2 days, last week/7 days, last 2 weeks/14 days, last month/30 days). There is some form of "responsibility" on these "users who have been here for quite a while longer" to make decisions on the validity of new tags, or change them via a retag if required. Some users (to isolate @lockstep) are retag daemons and try to organise the site accordingly.
Finally, and more in line with your question. I think the path tag has more to do with "file systems path" than it has to do with drawings or "graphical structures", since the latter is predominantly covered by tikz-pgf or pstricks and the like; each of which has such a rich set of macros that it would be infeasible to have a tag specific to each "graphical structure" within them.
My suggestion would be to perhaps define path as a synonym for filesystem-access, or even rename filesystem-access to file-system. Admittedly I am new to this kind of issue, so I hope my ramblings are understood.
