you forgot sulfides in the dirt so prevalent that water would turn to sulfuric acid. also a complete lack of magnetic field making hard radiation extend from space to the surface. the atmospheric pressure is as you said, super low. but the implication of that is the dust storms are just that: dust. aka fines. which get into everything, every tiny crack, grinding at your suit when you take it off, in your food, in your lungs, fucking everything. humans would need to return to earth to have kids. the kids would need to grow up on earth before returning to mars, then, like all adults on the planet, keep regularly returning to earth every few years to avoid death from bone density loss, organ failure, and malnuitrition. every drop of water and every gram of food would need to be shipped in from earth. for fuck sake, make deep sea habitats here. make permanent lunar stations, spaceports or cities. mars is lunacy. and elon is smart enough to know all this. it isn't a con, it's meant to inspire us. but the idea is fucking dreadful.
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