The question about Make it impossible to create tags with no wiki description contains multiple interesting viewpoints (answers) that all seem to make sense.
However, by allowing empty tags to be created (as is currently the case), chances are that such (empty) tag gets used in 2 (or more) completely different ways. And the more popular such empty tag becomes, the more these chances go up (and the harder the retagging will become).
Before reading on, what would "you" expect a tag like guide (on SO) to be related to? Refer to my question about Split [guide] into more specific tags (from Apr 13, 2015) for an illustration of that tag, and how it was used for 2 completely different things. The tag excerpt was empty until my suggested edit for it got approved (on Apr 14, 2015). For another example, refer to The "net" tag is used for different purposes.
Note: IMHO, none of the "Questions that may already have your answer" (which show up when creating this question) are to be considered as a duplicate, though some of them come close, such as Promote tag wiki creation for new tags.