There's also loads of interesting stuff going on all the time in that space, in a way there just isn't for C#, C++ or Java. I'm finding it really interesting and exciting to work with, and I'm not really interested in all the "toy language" stuff. If it's a toy, then people are creating some pretty cool stuff with the toy.
I also think that many people come to development by the frontend door as it's more visual (as you said). And JS has a reputation for being cool, so they choose it to start.
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