Jobs in tech seldom involve carrying around half one's body weight in equipment, and the ability to recover from serious injury is less likely to be important.

Right, serious injury would probably lose you the job entirely.

And Hollywood...

Hollywood loves them, esp. if you come from money. To get a foot in the door anywhere, there's unpaid internships that you might work anywhere from 3-6 months, then maybe roll onto the next. I've met people that interned for 1-2 years before getting a Production Assistant job (pays about $12/hr starting, IIRC) in which you step up from taking out the trash but are still working 12-hr days. Once you pass that hurdle though, you can keep moving on up to better pay and positions but the expectation is to pay your dues (for free).

Young, recent grads are great for that I guess because of how unencumbered most are but, when you look at the debate on diversity in Hollywood, it's not about what's in front of the camera but about the opportunities behind the scenes, which your background might limit when you're starting out.