Nobody ever doubted that fusion ignition was physically possible. It happens in stars all the time, and people have achieved it in thermonuclear weapons. This

Nobody ever doubted that fusion ignition was physically possible. It happens in stars all the time, and people have achieved it in thermonuclear weapons. This was the first time fusion ignition was achieved in a laboratory setting, i.e. in a controlled fashion. Is that seen as a fundamental physics milestone? To me it seems more an incremental engineering achievement.