&gt; I&#x27;d bet the main problem is that they don&#x27;t use C++ much themselves internally<p>I doubt they use <i>all</i> the languages their IDEs support internally - there&#x27;s just too many! (Java, PHP, Javascript, Python, C&#x2F;C++, Ruby, Obj-C). The problems are probably because CLion is one of their least mature products.