(For the purposes of this post, disregard the beta and meta sites on the SE Network.)
We know what reputation is, right? When you reach a certain milestone of rep, you gain a privilege. What's strange for me is that the same privilege on different sites have varied/different milestones.
My most notable site, Mathematics Stack Exchange and Software Recommendations Stack Exchange has different milestones for the "create tags" privilege, where Math SE needs 1k and SoftwareRecs SE needs 300.
So why does each site have milestones different to others?