Auxlangs also remind me this XKCD comic about standards. Because there’s no such thing as “perfect auxiliary language”, and once people notice an issue with one, they might create another.

Myself included - I’m not ashamed to say that my first conlang was an auxlang. I handled vocab by importing it from “the big five” (Classical Latin, Attic Greek, Classical Arabic, Sanskrit, Middle Chinese [reconstructed pronunciation])… at least at the start, then I got a bit too recursive and went for Proto-Indo-European, Proto-Semitic and Proto-Sino-Tibetan instead. (It was still “old world-centric” though. In a hindsight I could’ve used Quechua and Nahuatl.)