You claimed without evidence, or more accurately, bad evidence, confusing RTOS with "reliability and security." And you were somehow confused that security mattered for systems with no network connection.

FYI: For most commercial network equipment (internet backbone and similar), reliability and security are the highest priority. Most of that is Linux, BSD, and friends.

> You claimed without evidence, or more accurately, bad evidence, confusing RTOS with "reliability and security."

That sentence is grammatical nonsense. Try again to articulate your point so it is coherent.

Furthermore, you have still failed to present any historical examples for literally any of your bullet points or articulate any of the claimed upsides you purport have failed to pan out. In contrast, I have pointed out two frequently claimed upsides, reliability and security, that have demonstrably succeeded to such a degree that prevailing monolithic systems were largely replaced with microkernel systems in domains where reliability and security are highly valued such as aerospace and defense. To the extent that monolithic systems are still used, they were either the legacy option that has not been replaced or chosen where cost reduction is the highest priority, not security and reliability.

> FYI: For most commercial network equipment (internet backbone and similar), reliability and security are the highest priority.

Frankly, I find it baffling that you think that nuclear weapon systems, military jet fighters (which are network connected by the way), and commercial jetliners (also network connected) have lower reliability and security requirements than commercial networking equipment. And this is ignoring the fact that commercial networking equipment is some of the worst with respect to reliability and security. Cisco, one of the largest vendors in the space, routinely has trivial remote authentication bypasses allowing complete takeover. Here is one from last month: https://app.opencve.io/cve/CVE-2026-20181. One from earlier this year: https://app.opencve.io/cve/CVE-2026-20079. Or this one: https://app.opencve.io/cve/CVE-2026-20127. How about this one: https://app.opencve.io/cve/CVE-2026-20182.

Commercial networking equipment security is a joke. Find me literally any technical person who would claim that Cisco can defend against state actors. I will wait.