Yes, many longer posts do not do nearly as well. However, that opens up many paths you can take. When you come up with that great idea to write about you can split it into many separate posts in order to cover the whole topic.

I think often the longer post rarely get read through in its entirety. A topic that might take 3K to 5K post can be split into many 3 to 5 post each containing 1000 words. I think it will get more attention but it also will allow readers to cover the information much more quickly.

This method is also a tremendous help if you are attempting to put content out each day but do not have an abundance of time to write due to other life occurrences.