All that does is reset the rewrite rules. You could do the same by visiting the permalinks page and clicking save. You do need to reset them once but not every time. There is no need to flush every time you call register_post_type
All that does is reset the rewrite rules. You could do the same by visiting the permalinks page and clicking save. You do need to reset them once but not every time. There is no need to flush every time you call register_post_type