 very narrow scope of interaction, limiting the impact of potential attacks.</p></li><li><p><em>Extensibility</em>. It was imperative to design a simple extensibility model to allow Istio to interoperate with as widest breath of backends as possible. Due to its design and language choice, Mixer is inherently easier to extend than Envoy is. The separation of concerns also makes it possible to use Istio policy and telemetry processing with different proxies, just as a mix of Envoy and NGINX.</p></li></ul><p>E