For now you have tou use your own indexes for posts over 7 days old or use external sites like steam search, I agree with you and have been saying something like this for a while.

This post is my best guide on the subject so far;
https://steemit.com/writing/@godo/the-digital-world-is-evolving-we-need-to-prepare

also we could do something like;
https://steemit.com/tao/@tool-shed/0

I think the site was designed like this to encourage more posting, but with people spending so much time why not build an archive?

For now we just have the tags.