Well, the add-ons that help with most of those aren't Atlassian add-ons.
The existence of a 3rd party add-on that implements features that have been requested is actually something that pushes the feature down the list for Atlassian to implement in the core product.
Because copying things is needless duplication, and generally a bad thing to do. Update the original, you've got a history if you get it wrong. Or include pages from the original if there's a genuine need for a copy.
So, to answer the question, no, there's still a reliance on add-ons for a function that you should not really need often enough to include it in the core.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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