But what's that got to do with the question of statehood for Palestine?

Is the suggestion something along the lines "These Arabs don't know how to look after a country, just aren't up to the job"? I've heard that kind of suggestion, and I despise it. I'm not accusing you of endorsing it it, but I'm puzzled by how you see this map as relevant in this context.

In any case Egypt has plenty of intensively cultivated land over by the Nile. The effort and expense involved in irrigating way out by the border in the Sinai isn't seen as justifiable. As for the Gaza, which is relatively intensely cultivated, as the map indicates, cultivation is reduced by various factors, including the availability of water, where effectively Israel controls things.   And of course it was devastated by the last Israeli blitz. Plus of course if you try farming near the border with Israel you are liable to get shot.