Because that's not economical. It's cheaper to ship in the electricity directly, or if you don't want to build the HVDC lines (there are good reasons for that), turn it into Hydrogen, ship that and turn it back into electricity. Electrolysis is reasonably efficient (>70%), and the round trip to electricity can be done at 40% efficiency or so. Charge an EV with that elecricity and you're still much better off than first turning the electricity to Diesel (<30% efficienct) and then burning the Diesel (<<40%).
And that's not even taking into account all the health benefits of not burning stuff where people want to breathe.
You don't need a lot of space for wind and solar. Take Germany for example. Using just the area currently used for "energy crops" (around 2.4 million hectares) for PV you could cover most of the primary(!) energy demand of the country. Wind is even more space efficient in Germany.
Yeah perfect idea using farmland that could be used for growing food wasting on PVs. Do not get me wrong, there has something to happen but perhaps only solar and wind will not safe us as long as we have no good battery technology. Therefore it would be better to store this in some fuel.
We already use that farmland to grow fuel instead of food, and we also have the technology to store the energy: electrolysis. But because that is relatively expensive you don't want to burn that fuel in shitty tiny generators, you want to burn it in efficient combined-cycle plants.
You also have charging losses which electric cars, they are just not that high as with e-fuels. E-fuels have the advantage of being easily transportable and refuel is done in 1-3 minutes. So why not create them in countries that have much sun (free and endless energy) and convert this into something useful.