What this probably shows is that the guardrail-approach is not working. If they need to massively overblock to keep things out that they think they need to keep out to avoid bad press, then this strongly Impacts, as you say, usefulness. And they would not do that unless they think they have to.
Raw networking and kernel modules are areas that are hard (I have experience with both) and even only having a good lookup tool (which is one of the things LLMs can do, as long as you verify the answers) would be very beneficial. If they block that, they do so because they have not found anything better.
The whole idea of LLM agents and LLMs doing active stuff is not ready for prime-time. Not a surprise, that usually takes 10-30 years (sometimes longer) from the initial demo, and we are now at year 5 or so and this is high-complexity stuff, so probably 10 years will not be enough. And no, throwing a ton of money or effort at the problem does not accelerate things. Sure, you can do some early stunts that way (like going to the moon a few times and then not doing it again for decades, because the tech was not really there and things were done with extreme effort), but getting things to maturity takes time. One thing people generally do not understand, but the history of science and technology and engineering in particular, is clear. There are no real shortcuts and things are moving slowly.