&gt; Bilingual data is highly repetitive<p>That depends on which pairs someone has and which concepts they (re&#x2F;dis&#x2F;_cross_)connect to understand something.  For instance, Spanish and Portuguese (a common combo, both stemming from Latin) and Hebrew and Arabic (another common combo, both stemming from Semitic languages) provide less cultural variation and thus conceptual synergies than when someone cross-pollinates them.<p>&gt; (2) And not every concept is useful - (1) what use [is] [grammatical gender]?<p>(1) It gives a window into how each culture understands a given field and Universe overall, eg  <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Noun_classes#Common_criteria_for_noun_classes" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Noun_classes#Common_criteria_f...</a> .  (2) It may get too cold or too hot one day, so changing your houses&#x27; windows&#x27; degree of openness may help you with your current homeostatic needs... welding them into that place, even if that change makes a huge difference, probably wouldn&#x27;t work out long term..  A simple stick of a suitable height, or none at all, or perhaps a counter balancing weight, will work much better.<p>&gt; Add in that fact that as a tool for communication, you won&#x27;t be able to use you full vocabulary everywhere.<p>Perhaps it would make sense to prune our English vocabulary.  After all, less is more, and the whole is greater than the sum of its parts.  If you regularly add new tools to perform previously unforeseen functions in software you use\write, then perhaps your optimizations for these specific features comes at a cost of generally misunderstanding software and information structures\informatic processes.  It doesn&#x27;t necessarily take more to do more.<p>&gt; In addition, seems like there is an obvious difficulty wrt incompatible grammars.<p>Luckily we have two hands, so we can easily hold on to two branches (as long as we have them within reach).  Even if one bears one kind of fruit and another a different one, simply remember how to swing back and forth and you can get fat and happy with your varied sets of friends and fruits. :D<p>&gt; There&#x27;s nothing preventing you expanding you current vocabulary in your native language (jargon) - why do you need to learn a new language?<p>C&#x27;est si bon<p>Lovers say that in France<p>... <a href="http:&#x2F;&#x2F;artists.letssingit.com&#x2F;louis-armstrong-lyrics-cest-si-bon-fv23s8d" rel="nofollow">http:&#x2F;&#x2F;artists.letssingit.com&#x2F;louis-armstrong-lyrics-cest-si...</a>