What engineers love about Istio in 2026 is how it moves complex networking logic out of the application code and into the infrastructure layer transparently.

Zero-Trust Security & Observability: It provides automatic mTLS encryption and deep "Golden Signal" metrics (latency, errors, traffic) for every service-to-service interaction without touching a single line of your code.

Ambient Mode Efficiency: The shift to sidecar-less "Ambient Mode" significantly reduces resource overhead and operational friction, finally making enterprise-grade traffic management lightweight and easy to maintain. Review collected by and hosted on G2.com.

Its primary drawback is the crushing operational complexity and steep learning curve required to manage its vast array of Custom Resource Definitions (CRDs) and troubleshooting layers.

The significant resource overhead of sidecar proxies—injecting extra CPU/RAM usage and millisecond latency—can become a "service mesh tax" that outweighs benefits for smaller architectures. Review collected by and hosted on G2.com.