Absolutely right! I raised the point couple of weeks ago citing that perhaps 1 tag or category per post is sufficient to group the article accurately. On wordpress you can add category and tags.
Hashtags could've gone in the 'tag' section and the topic tag could've been a category.
It would've been easier to curate content because this organizes it better. Now you'll see stories irrelevant to steemit being tagged with it.
But, some feel 5 categories is appropriate to tag content and hence it is the way it is. People don't follow without guidelines. Hopefully we can set some moving forward so it becomes easier to curate good content and people realize the importance of appropriately organizing their work.