Also don’t forget the biggest benefit over solar/wind: it keeps on generating power on cold windless nights.

No need to worry about Cold Dunkelflaut!

https://www.youtube.com/watch?v=Q8xsg9iK5yo

Isn't tritium used in fusion and a potential weapons material?

It's not controlled. It does help boost some fission weapons. But it's not the hard part or critical piece of producing a nuclear weapon, and you can get by without it.

To illustrate how little it's controlled-- I have a little bit on my keychain as an alpha source with a phosphor so my keyring always glows.

It's a fission yield booster. It's as much of a weapons material as charcoal is.

Depending on the scale and reactor design, we have really good examples of run away fusion reactions. Run away reactions are easy, controlled ones are hard.

And whilst I won’t doubt that if fusion ever becomes commercially viable the reactors would be walk away safe it doesn’t mean that you don’t need to account for that in your design.

What is an example of a run away fusion reaction?

The US strategic arsenal.

A Hydrogen Bomb. It is basically using a nuke (fission) to trigger fusion instead of lasers.

That is a run away fission reaction that ignites a short lived fusion reaction. We don't even talk about neutron populations or k factors in fusion because there is no avalanche effect possible.