For me, there is a lot of work setting it up, getting the themes where you want them, then finding one of 100 various plug-in's for SEO or twitter or whatever, and figuring out which is the best, and which has the least security holes.
You are right, at the core, it is simple, but it is time consuming to me. And it falls over under load unless you have a bit of time or money to throw at it, or both.
I like the idea or working in a text editor of my liking, knowing that quote marked in code aren't auto converted to smart quotes, knowing that the raw markdown is raw, and I can move it anywhere.
I am sure you can do all this in Wordpress, I am just looking to remove all that overheard, as starting a blog again is feeling more daunting than ever given my current medical issues. If I can just get it off the ground I will be happy.
But I feel I have to do something, so I want to do something that gets me to my end goal as quick as possible, but allows things to possibly grow without me thinking about what a Varnish, CDN, Cloudfront, etc all are.