Great post. There's no inherent limitation in the data structures on how many tags a post can have but I am glad most frontends still limit the quantity because limits encourage focus.
I've done a few tagging projects and what tends to happen is that conventions arise around the tags and a taxonomy of tags, both types and values, emerges. For example, now posts have tags for community, topic and language (at least). These types of tags are not conceptually equivalent.
Given that there are more types of tags, it makes sense that we increase the number of allowed tags higher than five. Also, as the conventions around tag usage become culturally codified, we can consider formalising the tag by moving it into the json_metadata of a post.

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