Microsoft Word is made to put words on paper. That was the entire idea.
I’ve blogged for years directly into the backends of various sites, and if I want to save something on my hard disk I use a simple text editor. I barely touched Word until I started needed the formatting again for stuff going on paper.
So complaining that you can’t write blog posts on Word is like complaining that your kitchen knife sucks because the handle gets hot when it’s put in boiling water: yes, a 50 cent wooden spoon does a better job than a $100 knife when it comes to stirring a sauce, but no one told you to use it for that in the first place.