I’m not sure I agree with this sentiment. You can type something "by hand" and still have almost no voice in it if the incentives push you to flatten it out.
A lot of us spent years optimizing for clarity, SEO, professionalism etc. But that did shape how we wrote, maybe even more than our natural cadence. The result wasn’t voice, it was everyone converging on the safe and optimized template.
If you chose to trade your soul to 'incentives', and replace incisive thought with bland SEO and professionalism -- you chose this. Your voice has become the bland language of business.