Because I tend to use an iterative programming technique, where I make a small change and see how it works and then make another small change, etc, manually copying the .apk is a hassle. But I've got B4A Bridge working and it seems nice and fast.
I'm slowly working my way through the tutorials and I'm very pleased with how easy this is compared to the whole Eclipse/Java thing (which I did get working but because I'm not much of a Java programmer I struggled with it). BASIC is way easier, I've been programming in BASIC for the last 30 odd years.