Sure, only use threads when you actually need them. The cases where you actually need them are quite numerous, though. E.g., you have a library that connects to

Sure, only use threads when you actually need them. The cases where you actually need them are quite numerous, though. E.g., you have a library that connects to something over the network but the library is blocking. Or you need to respond to events quickly but for some events you need expensive calculations. If you can get away with copying data to the threads so shared state is minimized this will help. The general principle is to make things as easy as possible instead of as difficult as possible.