True, but that’s per wiki instance. The infoboxes are specific to each wiki, and that’s Lua code, placed in a special namespace and duplicated (or rather, rewritten) on each wiki. They also (TW: software coding horror) manage that on the wiki directly. There is no git/svn, the code is on a wiki page, edited using the online text editor. No PR/MR, nothing. Also, directly deployed in production…
And there was also a strong pushback against Wikidata on at least the french Wikipedia, for some reasons I can understand (it make harder to watch vandalism, a problem that can be solved) and some that sound just dumb. I suspect this started to change (because of Wikipedia structural problems leading to burnout, people sooner or later leave when they are too implicated in some discussions).