JAnD added a comment.
I thing this old codes (dk, jp etc) are used nowhere. But other codes (be-x-old, za, ik, ch...) are problematic - is not possible work on all categories on all wikis, because bot crashes. And using compat instead is problematic too, because of different bug. There are now only few families (wiktionary, wikibooks, wikiversity) on wmf wiikis, which are still using old-style interwiki. But at least wiktionary wil not have wikidata for long time yet. So we need functonal and stable interwiki bot.
TASK DETAIL https://phabricator.wikimedia.org/T74674
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To: JAnD Cc: pywikipedia-bugs, XZise, JAnD, Mpaa, Kronf, Nemo_bis, MZMcBride, jayvdb