Agreed. That is why I said variable up to around 100,000 ISP. For low thrust application having high ISP is great for saving propellant. The key feature for a fusion rocket is that one can have tanks of deuterium as the propellant you can mix into the plasma that is also the fuel.

I think the general public has just completely given up on seeing any kind of new, radical cool tech but with the decline in the anti-tech baby boomer generation a lot of progress of long dreamed projects are starting to happen. SpaceX has lead the way with reusable rockets.

Here is a link to a video from a real company that is actively researching and building fusion rocket prototypes[1].

[1]Fusion drive page: http://www.psatellite.com/tag/dfd/ [2]video: https://www.youtube.com/watch?v=F3ao5SCedIk

And here is a link to a technical paper if you are interested[3].

[3]https://w3.pppl.gov/ppst/docs/Cohen2017ibis.pdf