Actually, Linux kernels are overwhelmingly the most common thing to run in Firecracker VMs, and at any rate that isn't relevant to your assertion that you cannot "bolt a userspace kernel on top of an insecure and bloated kernel to make it secure"; that would still be mistaken even if the userspace kernel did have to have a very different memory model, hardware access, and so on and so on, from the underlying insecure and bloated kernel.

As for whether this is a technical conversation or not, I think there's an interesting split: all of my comments in this conversation have been technical, and informative to boot, while the technical content of your comments has been limited to trivial statements that are easily shown to be incorrect.

Instead, your last two comments have contained personal attacks, which I have so far refrained from. (You may have noticed in the past that, when you repeatedly launch personal attacks on people, they usually respond by personally attacking you too, but I have not done that.) Your latest comment is over 50% personal attack by byte count.

Why is that? Have you considered thinking long enough about one of your comments to post something technically correct, original, or both?