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But then all of your posts have to compete with every other post that's ever been written. Going back 3 years so far.
I wrote about it a while ago, here.
https://steempeak.com/steemit/@mattclarke/scratching-the-7-day-itch-or-how-i-learned-to-stop-worrying-and-love-the-short-payout-window

Yes, wouldn't that increase the quality?
Especially on Blogs, some posts might need some weeks to really grab attention and surge.

If a topic somebody has written 1 year ago all of the sudden gets trendy again. That would be a market at work in my opinion and reward authors better for their input.

Eventually, competing against older written posts should not be a problem.

If somebody new read the old post I just linked to and resteemed it; and some of his followers did the same, I'd be delighted. People can still reply to it and share it. They can follow me. I can reply to their reply, and they can upvote my response; there's a heap of ways older posts can benefit an author.
I did a post 'Sudoku without Numbers'. Its 2 years old and its on the first page of the google search results. That's fantastic, and plenty of reason to pour effort into a post.
That may not translate as quality, which is fairly subjective; but its justification to give it a red-hot :)