Simply, these features have a legal standard to uphold and the software vendor may be liable for these features misbehaving.

For example, your healthcare software incorrectly exposes Patient Health Information (PHI) due to a bug in your RBAC. You don't just ship a patch that fixes this, you are liable for the PHI exposure up to $150k per PHI exposure...

How do you prevent this? You charge more for these features and use that money to purchase liability insurance.