I know this will seem odd, but there's a skill issue sometimes. Defense companies often have a lot of people, relative to purely commercial companies because the US government likes to have its money go to a lot of constituents. Defense companies are also under equipped sometimes, for the same reason - the gov would rather the money go to voters.

There's the effect of classification too: new tech often doesn't get used in classified programs because it's hard to get new people cleared.

For these reasons and more, folks working in aerospace are often behind the curve.