Your comparison is interesting, but let's consider some historical facts. The Apollo program, which successfully put humans on the moon, actually employed many principles we now associate with Agile methodologies.
Contrary to popular belief, it wasn't a straightforward Waterfall process. NASA used frequent feedback (akin to daily Scrums), self-organizing teams, stable interfaces so that teams are an independent path to production, and iterative development cycles - core Agile practices. In fact, Mariana Mazzucato's book Mission Economy provides fascinating insights into how the moon landing project incorporated elements remarkably similar to modern Agile approaches. Furthermore, here's a NASA article detailing how Agile practices are used to send a rover to the moon: https://ntrs.nasa.gov/api/citations/20160006387/downloads/20160006387.pdf?attachment=true
While it's true that building rockets isn't identical to software development, the underlying principles of flexibility, collaboration, and rapid iteration proved crucial to the missions' success. Programs like the Apollo program adapted constantly to new challenges, much like Agile teams do today.
Regarding Kanban and Scrum, you're right that they fall under the Agile umbrella. However, each offers unique tools that can be valuable in different contexts, even outside of software.
Perhaps instead of dismissing Agile outright for hardware projects, we could explore how its principles might be adapted to improve complex engineering endeavors. After all, if it helped us reach the moon and, decades later, send rovers to it, it might have more applications than we initially assume.