How easy it to to replace that massive part in an accident or Tesla's a a throw away car in an accident involving that rear end? Pro's and con's to each design.
Additionally why are so many more companies generally profitable whice Tesla is not?
Aluminum repair is more difficult than steel always has been. A crash big enough to bend or break the frame casting did its job protecting you. Giant single pieces like this are very cool feature that makes the car and the companies bottom line better.
Are they more profitable?
Only a very few are... maybe with bankruptcies, mergers and bailouts under their belts others have become so, not exactly role models of financial discipline.
A better question is: How many other car companies can make money on a BEV?
Then boil it down further and ask how many can make money on a 35K midsized BEV with any kind of range or features?
After all they have to split their efforts between standard cars and battery vehicles, they lack the basic battery pack production infrastructure, as well as the unified command/control design that takes multitudes of subcomponents out of the equation. They have to job out too many of the parts because they lack the core at this stage. The are still basically "electrifying" regular cars vs building bev's from the ground up.
Then you get to actual user infrastructure like charging and when you add up all the pieces they are all a decade behind.
The other guys rob peter to pay paul and take profit from their ice lineup to subsidize their BEV's.
Not exactly a model thats sustainable as you sell more and more BEV's.