You're talking about the same thing. High energy neutrons leave the system. They cause damage to the container (ie neutron embrittlement) and that's a separate

You're talking about the same thing. High energy neutrons leave the system. They cause damage to the container (ie neutron embrittlement) and that's a separate problem. But the real problem is the energy loss from the system. Charged particles can be contained. Personally I think there are limits to even that because a high-temperature plasma is turbulent [1]. Containing that is just a hugely difficult problem. I'm not convinced that nuclear fusion will ever be commercially viable. All while we already have emission-free, reliable and cheap energy production in the form of solar power. [1]: https://www.psfc.mit.edu/research/topics/plasma-turbulence https://www.psfc.mit.edu/research/topics/plasma-turbulence