The 7 day limit is a tech limitation, more than a decision. Perhaps in the future there may be ways to make a post “evergreen” but I do accept and understand it.
To your other point, I say... add Steem to your blog! Too many people forget or don’t realize that there is so much more to Steem than just Steemit. I’ve gotta put a lot more work into my sites, but I’ve been so psyched playing around with https://finallycomments.com/
@sambillingham is building an amazing project, there’ll probably be a WordPress plugin soon. I just currently manually embed the code in the footer of my WordPress posts that mirror my Steemit content.
Creators fan bases never even have to come to Steemit to gain the benefits of Steem.