I can't find the RfC for this. Could you give me a link to read input from community?

I understand your input. My suggestions were to a future version of the extension(s), not the current deployment, which has been feature-frozen in order to become stable.

Could it be set to fetch contents from several wikis?
For example:

$wgWikipediaExtractsAPI = array ('//en.wikipedia.org/w/api.php',
                                 '//en.wiktionary.org/w/api.php',
                                 '//en.wikiquote.org/w/api.php'
);

But if it would be like that, there should exist a way to solve a conflict between pages with the same name in several wikis.

Can the parser function extract contents from a user-chosen section? For example, it currently can fetch full text, a number of sentences or the intro. Instead of intro it could fetch sections, leading section included:

In T149424#3413685, @Sophivorus wrote:

Anyone remembers this task? The extension would still be useful at the English and Spanish Wikiversity.

This issue is also present in Spanish Wikivoyage.

In T125000#1986805, @Dereckson wrote:

@Zerabat The extension has been deployed.

Do you have any input for namespaces?

In T125000#1980370, @Dereckson wrote:

@Zerabat In what namespaces do you intend to use the extension?

By default, we'll deploy it for NS_MAIN and NS_USER, so both articles and draft in user space can have one.