My point is that there are actually very few concurrency problems where deadlocks are solved by increasing the buffer size by some fixed amount. If you want your code to be correct, in most cases a buffer size of 100 might as well be a buffer size of 1, except that an increased buffer size can improve performance for some scenarios.
When people talk about asynchronous channels, they usually mean that you can stream messages to another actor and know that you won't block. That is not true for Go channels. You can increase the buffer size, but that just reduces the chance that your program will deadlock: it doesn't make a Go channel work in situations where you need an asynchronous channel for your program to be correct.
then your normal program flow won't block. I guess that's what you mean by deadlock. If your program runs into an actual deadlock, the runtime will detect it, crash the program and show stacktraces.
When people talk about asynchronous channels, they usually mean that you can stream messages to another actor and know that you won't block. That is not true for Go channels. You can increase the buffer size, but that just reduces the chance that your program will deadlock: it doesn't make a Go channel work in situations where you need an asynchronous channel for your program to be correct.