[tdeck]

Let's imagine for the sake of argument that I don't need to write a compiler or interpreter. What else is FORTH well suited for?

[cmrdporcupine]

It's often used in bootloader/firmware type stuff (or was) because it can be a bit higher level than assembly and not subject to the same types of vulnerabilities and crashes... but written in a few KB and even easily hand written in assembly. And often run pretty fast, depending on the architecture.