There is a slang expression in English "everything but the kitchen sink" which means one used everything in one's arsenal, which usually means, one used a bit too much of everything.
When we created the tag categories for blogs, the original idea was to help people subscribe using RSS feeds and also to help people to navigate to specific: Blogs by Category
Over the growth of this website and its respective communities, the number of blog categories has grown.....and grown.
What we now see are people using tags indiscriminately (over-using) which defeats the idea of making it easy for people to subscribe and see a more personalized view of content.
To remedy that complaint (of overuse) we have limited the tags to 5.
So please, when creating your post do consider the reader, the reader's time, the reader's interest, the reader's ease of access.