When the space of possible commands is large like GDB, it can get you the right incantation faster. It’s great for ramping up on a language or tool you are not

When the space of possible commands is large like GDB, it can get you the right incantation faster. It’s great for ramping up on a language or tool you are not fluent in; for example “how do you do X in C++”. It’s not great IME for writing large chunks of code, though some seem to be having good enough results there.