It sounds like this need only existed because the product existed in a zero-sum game. If supply was increased, presumably players would need more.
In non-zero-sum real life, things are different. People didn't need antibiotics before they were invented just as people don't currently need to live to 200 years old since we don't have that technology either. I can't find a clear boundary between need and want. Need seems to be just "very want". Some people end up with less than others and the world keeps turning. We don't even need seemingly essential things like water because we can survive a few days without it. Just as seriously ill people can survive a few days without treatment (which may or may not have been invented yet), and normal healthy people can survive a few days when they're already 100 years old and we don't have anti-aging tech.
It's more complicated than "just increase the supply". We've seen this play out in the first half of 2020.
1) Retooling factories and setting up supply chains takes time. You can't just start pumping out PPEs out of a new plant in a week; it takes months to organize.
2) In an emergency, by the time the production is ramped up, the demand may be gone. Some mask manufacturers were reluctant to increase their capacity early this year, because they've been burned by this in the past: they've overproduced for SARS, only to see the demand evaporate as the pandemic subsided, and were left holding the bag.
The dictionary definition of "need" is instructive.
The first definition (in Collins 2018) is "to be in want of", so in a sense you're right. However, one of the subsequent definitions is "distress or extremity", followed by "extreme poverty or destitution". "Need", then, is a want that's extreme enough to cause suffering if it's unfulfilled.
In that sense, people did need antibiotics. They might not have known it, but they did. In the same way, today we need treatments that we haven't discovered yet. "Being able to survive" isn't the bar. "Not suffering for the lack" is.
In non-zero-sum real life, things are different. People didn't need antibiotics before they were invented just as people don't currently need to live to 200 years old since we don't have that technology either. I can't find a clear boundary between need and want. Need seems to be just "very want". Some people end up with less than others and the world keeps turning. We don't even need seemingly essential things like water because we can survive a few days without it. Just as seriously ill people can survive a few days without treatment (which may or may not have been invented yet), and normal healthy people can survive a few days when they're already 100 years old and we don't have anti-aging tech.