To counter,
"first lightbulb", "first automobile", "first airplane flight", "first color photograph" etc. are always arbitrary thresholds; much ink has been spilled over who, when, and where; over what exactly makes a lightbulb or whatever else. "First rocket" was probably constructed & launched around the time of gunpowder invention, i.e., in the 9th century China. That's not quite the same as reliably getting cargo & crew to the ISS.
In contrast, "first commercially successful" is about as clear-cut case of inventiveness and crossing a threshold as there can be: the product was made worth more than its costs, and thus became viable for large scale deployment. Whether by one big change or accretion of several smaller ones. Some key inventions regarded manufacturing process rather than the end product itself, and thus are easily lost on a casual observer.
Commercially viable means a fleeting dream got turned into an ever growing reality for us all. To wit, we already have had some /nuclear fusion reactors/ up and running. But we will only perceive it as a real thing when it becomes commercially viable.