This feature was developed by Hive account@bitcoiner and submitted to the steemit.com/Condenser github repository but was blocked by Hive account@sneak: https://github.com/steemit/condenser/pull/819

Hive account@val said this in January:

Rather than splitting Blog into two tabs we decided to add some more filters to Blog page so users would be able to filter posts by author (including blog's owner) and by tag.

But there is no implementation of this, 5 months later.

I fully agree with your points made, and I have resteemed zero posts on this account for the same reasons. I'd like to resteem, but not if it will clutter up the only listing of my own posts. Resteem filtering on profile pages is long overdue.