We have rules about sources that MUST be excerpted. Hope this helps.
But not that you have to leave out the important parts.
When I excerpt something, I try to choose the most important 300 words. It’s more work, but that way the information is here, and you don’t have to go to the other source that might change their links or might be blocked for some sites.
I understand the exerpt rules.
But why not exerpt the MEAT of the article, in place of the first paragraph that usually has little or no details?
In other words, if you are going to post an article, make sure that your exerpt matches the headline.
That’s all I am saying.