Those aren't necessarily mandatory, but it certainly seems a lot of the safety tech is not available unless you also get things like that.
For reference, my wife and I bought a 2014 Mazda 6 Touring, which seems to be one of the few cars with a well-balanced mid-tier that doesn't cost an arm and a leg and still has good safety features (and did not come with heated/cooled seats).
For reference, my wife and I bought a 2014 Mazda 6 Touring, which seems to be one of the few cars with a well-balanced mid-tier that doesn't cost an arm and a leg and still has good safety features (and did not come with heated/cooled seats).