Great post. I loved all of your points but particularly number 2 on “beware of selling savings.” People really do value other things such as time unless you are selling a commodity like laundry detergent. And even then if you could improve someone’s experience of detergent by making it smell nicer or if it can make your clothes feel nicer that’s what you’d want to emphasize.
It can help, but other degrees also have content writing value. For instance, the ability to synthesize and relate complex information is key to content writing, but can also be acquired from studies in education or philosophy. Companies that offer content writing positions tend to find it easier to train someone in a complex topic than to train someone to write, however. For example, as a healthcare professional with mediocre writing skills, you're less likely to be hired as a healthcare content writer than a strong writer with no healthcare background (but who can be trained in healthcare topics).