English Wikipedia and other wikipedias use authority control template for displaying data from wikidata or other sources.
https://en.m.wikipedia.org/wiki/Module:Authority_control
Current scenario
The template has to be added manually to all the pages. If there are authority links, the template is used, if there are not, the template is simply not visible.
Problem
Many pages which have data on Wikidata do not have authority control template on Wikipedia and many pages which do not have such data have such template. Besides, making it a manual template thing brings in inconsistencies in its placement and use.
Solution
Rather than adding it manually to all pages, it would be good to make it a core a component and get rid of the hassle. A similar approach was adopted for the interwiki language links.
Discussions
https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(idea_lab)/Archive_23#Upgrading_Authority_control