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2001 February 19, Hessu, “a few questions about Esperanto”, sci.lang, Usenet, The biggest mistakes conlangers or artlangers do, is assume that learners of their IAL has same backround (languages, culture, religion and education) than themselves.
Source: wiktionary
There are also Idists and Interlingua-ists (the IALA kind) around, as well as conlangers and artlangers of all sorts... not to mention the Lojbanists.
Source: wiktionary
You're right that it's not the primary concern of the artlanger, but you might be surprised to learn that many artlangers have considered what their conlangs sound like to the extent of making recordings of texts and learning to speak others' conlangs.
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.