Things are different now
The Buccaneer was designed and built on a single site by engineers; aircraft these days are designed multi-nationally and run by project managers (don't get me started about them) and built across multiple sites.
When they couldn't get the milling machinery for 2 years the Brough engineers decided to make them themselves because they could. Nowadays the engineers can still do their stuff - A380,QE/PoW but they ain't the ones making the decisions.
Brough were pro-active on the specification and talked the Navy out of wanting it supersonic - made it heavier and reduced the range. It also had a single design aim that wasn't compromised - low drag. In everything they made engineering decisions.
These days the gestation periods are prolonged by the increase in system complexity and the methodologies which gives ample scope for vast amounts of documentation and empire building.
A major problem is that by the time the system is ready for production you can't get the electronic parts anymore. Added to which the pilot will have a more powerful and capable system in his pocket at the minute, on his wrist in the next few years and probably implanted under his skin a few years after that.