This might make sense from a high level, but again, the devil is in the details.
Realistically you do need someone (vendor or not) to translate 1000's of pages of legal jargon into actual product decisions. There's a tipping point where paying an engineer $x or $y to do that themselves (if they even have the skill to interpret it) is waste of talent.
Your product decisions are hidden in thousands of pages of legal jargon?