your arguments are a myth.....
At the time of the Exodus both Canaan and Sinai were controlled by Egypt.. There were Egyptians garrisons deployed in Sinai and they paid tribute to Pharoah.
Sinai is only 135 miles across at its widest point. People walked back and forth all the time.. Any time there was drought or famine, they headed for the Nile Delta.
2 million Israelites and their herds could not have survived in Sinai for 40 years. Even now it can only support a population of about 800,000.