Imagine there was a new drug that could indefinitely increase a person’s physical strength — the more they have, the stronger they are. In the aggregate, the increased use of this drug would increase the total physical strength of the human race.
Now imagine two regimes for distributing this drug. In the first, access to the drug is limited to a relatively small portion of the population, who are able to get as much as they want. Human physical strength overall would be growing under this regime, but the vast majority of the population would be effectively weaker with all these Incredible Hulks walking around — in fact, even if their own strength remained constant throughout the process, most people would be in greater physical danger by virtue of the very existence of the Hulks.
In the second, access to the drug is widespread across the population. Everyone is able to do one-armed push-ups and free-standing hand-stands, but no one is able to gain a significant edge over anyone else. Here I think it would be more meaningful to talk about a general increase in human strength, even if the aggregate effects of the drug were less overall.
If the first distribution regime were the only possible one, I think we’d all agree that it would be better not to have the drug at all than to allow, say, 1% of the population to become Incredible Hulks and walk around among us — even if the Incredible Hulks were able to “create jobs” by forcing the weaklings to slave for them.