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Liferay is very interesting when you have to manage a lot of sites and users.
In this case, the use of site templates is ideal.
It is therefore possible to create Web contents that will be visible on a particular site or on several sites of the same region, country or entity.
All of this is possible using site hierarchies (organizations) or assets libraries.
The problem in this case is that the asset publisher will offer the content of the different sites but their display page will not necessarily be on the current site or the content can be created without a default display page.

We want that a user of a site always stay on the current site with the right branding and not the site of the country or region. (if the web content has been created on the country or the region)
Our proposal would be that if the web content does not have a display page but if a page of the current site is named like the name of the structure of the current web content, instead of making an error, we could display the content on this display page intended for.

For my client, we implemented this.

The structure was created on the global site and therefore without a default display page, but we use a page with the same name as the name of the structure created on the site template.
We have 500 sites with this site template, this page is created on our 500 sites and contains an asset publisher who display the detail of the active web content.
So we overridden the native Liferay code in version 7.4u64 to do this.

It would be nice if it was Liferay native so that we don't need to check that our code remains compatible with the new Liferay code.
To do this, we simply override the class DefaultAssetDisplayPageFriendlyURLResolver.java and adapt the code to find the article not in the current site but in the parents sites or in the global. And for the display page, if none have been found, we try to find a page in the current site with the name of the stucture of the web content... so we search a page /web/my-current-site/structure-name-article.

If the stucture of the content is named "news", and the current site is "site-london" the url would be "/group/site-london/news" and the url of the content will be "/group/site-london/-/the-url-of-the-web-content" and not the url "/group/uk/..." or "/group/great-britain/..." or "/group/global/..." (I know, global site does not exist !)

Regards, Eric.