I've actually done that all day long, at most it takes 3-4 seconds between code editing and the app / test running, I'd definitely not trade faster build times

I've actually done that all day long, at most it takes 3-4 seconds between code editing and the app / test running, I'd definitely not trade faster build times for something else in that case, especially when my IDE highlights errors when I type which greatly reduces the need for constant rebuilds.