I just asked this question: Problem pairing again Nexus 5 with Alpine car stereo and added (correctly) the "pairing" tag but was informed by the system that I needed 300 points to add that tag - it then suggest a list of other tags I was allowed to use. NONE of which was appropriate - 'pairing' IS appropriate.
So, why doe this site not allow me, a user with over 10000 points on SO and a moderator on the newly defunct OnStartups stack exchange site, to add a pretty basic tag - which would actually help the question get classified better and help people give/find the right answer?