Actually no.
These are small os's, they're great and useful. There are others. My former, now banrkupt, employers claim L4 code I contributed to is running on over a billion phones. is uTron, eCos etc still dominant in that space?
This is not showing the touted benefits of microkernel based, multiserver operating systems. This is not a secure operating system, this is not a robust operating system, this is not self-healing drivers. Is very small, monolithic a better description of what these are?
Do something like spin up a web-server on a multi server OS and demonstrate it's very hard to hack compared to apache on linux. Make it convincing enough so people use it. DJB did this with qmail and it really is convincing. How long have mircorkernel proponents been talking up improved security, robustness and resilience? 25 years? More? So we've had time and a mountain of engineering resources, including some of my own. It's reasonable to ask to see it. If we can't, it's reasonable to ask why not yet. It really is reasonable to ask.
In my opinion it's a sign of weakness to simply belittle anyone who does. But hey, this is a weekend microkernel HN story perhaps mostly read by the microkernel faithful so reasonable may not be the way forward, easier to just to act as though it's somehow completely unreasonable. Because anyone who hitches their wagon to the next big thing desperately wants it to succeed, and why not? Promotion is important for mindshare and so on. I have sympathy but I think Feynmann summed it up correctly:
"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled."
I'll say it again so the point isn't lost:
I would love to see those benefits in the wild. I really, really would.