I can't speak for Python but the JavaScript community has been investing heavily in TypeScript, and the desire for a more integrated IDE experience is a huge driver for that growth.
Definitely true, though I think the problem is less severe with regard to TS because open source language-servers afford TypeScript IDE features universal availability which is not the case in JVM land. Also, consider the trend towards Kotlin in the Java world where a part of Jetbrain's business model relies on the fact that they created and maintain the language while also selling the IDE that makes the language practical to use (Kotlin being an amazing language notwithstanding).