Don't forget that the $promisedLand was already inhabited, so you have to kill every man, woman, child before you can have it. What's that? More questioning my authority? Let's see if 40 years in the desert strengthens your faith.
Sounds like a Nostradamus prediction where it was written in code, so people thought about a literal bush speaking. In reality, we see what was actually foretold panned out, but nobody wants to admit it.
Moses: um...lord, we're kind of tired of being slaves. Could you look into that?
Lord: Ok! I'll issue 10 plagues of increasing discomfort until Pharaoh breaks!!!
Moses: Couldn't you just teleport us to the promised land or something. These guys are jerks, but do you need to kill their kids?
lightning crashes
Moses: OK OK! Point taken. We'll do the plagues...