Embedded in general and IoT in particular are big these days and even though modern "controllers" are perfectly able to run scripting languages there's still a

Embedded in general and IoT in particular are big these days and even though modern "controllers" are perfectly able to run scripting languages there's still a lot of low level C going on. If you need to write a device driver you're probably not going to do it in Javascript. You can argue that it's a niche but it's a rather large one. C is not fully COBOLized yet.