A lot of guys are telling you it's because it the workability of aluminium which is purified bullshit. Panelbeaters rarely work panels nowadays, they replace them. The problem with Tesla is that they're gaping assholes when it comes to supplying parts to third party repairers. Repairing Teslas is expensive because that's how Tesla wants it to be.
To an extent, for banging into shapes, but it's challenging to add more material to it if needed. None of the options are especially good compared to welding, though that's just my opinion (compared to fasteners - size, brazing - high temperature but maybe).
Other materials have their own issues, but if you cast large pieces of anything you also make it super expensive to replace parts that can't be repaired onsite.
