Trying to do this produces 404 errors on the tag pages. Apparently there could be some sort of undocumented internal conflict. (permalink interface broken by default)
Desired Site Output:
Changed it in the "permalinks" section, and even tried a modification of category-template.php that rewrote the url seemingly, but still 404 error. You cant just pop "basename" into both cat and tag or it errors out on the tag.
Tried many combinations of setting the /blog base in the general section and permalinks.
I am comfortable changing myql fields if anyone knows. Also this plugin didn't help:
Top Level Categories
HOW TO HAVE THE SAME CATEGORY AND TAG BASE HAS ANYONE DONE IT SUCCESSFULLY. ( 10 pages deep on google trying, and 2 hours here )
inside wp_term_taxonomy a tag is designated with "post_tag" and category "category" but that looks like the only difference.. heck you could even give a tag a parent i wonder what would happen