When it comes to ShiftLeft, the most valuable feature is definitely its ease of use and cost-effectiveness. Previously, security professionals had to spend a lot of time and effort running around, asking people to fix issues in their products, architectures, code, and even networks.
With ShiftLeft, everything becomes robust and secure from within. Instead of relying on external measures like Web Application Firewalls (WAF) that are applied from the outside in, ShiftLeft takes a proactive approach. It helps prevent issues from arising in the first place, making it much easier for both security teams and developers. It's also cost-effective because you don't have to constantly go back, make changes to the code, and then push it again. Writing secure code from the start ensures that there are no vulnerabilities when it goes live. So, I would say the main features of ShiftLeft are its cost-effectiveness and ease of adaptability or use.