I’m not sure adding 20 more engineers guarantees these problems don’t happen.
There is very little substitute for real experience running a design for millions of flight hours, as the article points out.
There is very little substitute for real experience running a design for millions of flight hours, as the article points out.
You can also improve your simulation (here the sky is the limit).
It really depends on the cost of mishaps and design failures, if it's high enough you can almost always improve design with additional expenditure.
If you look at aerospace, the craziest rocket company (RocketLab) looks like it has an average age much less than NASA, with SpaceX in the middle. Which is about what you would expect.