Take this post as an example https://discuss.pirateparty.org.au/t/should-there-be-a-limit-on-the-number-of-children-one-person-can-have/1914/43
You can see he makes two smaller post in quick succession. Ideally the original author would edit the original post (But there is an edit window you are allowed to edit only in).
I think something like multiple post from the same author should be merged into one post automatically, if it is below a certain size. You can still deliminate with a line saying 4 hours later etc…
But it would reduce visual clutter this way.