Off the shelf choice. NACES was the Standard Navy seat at the time.
When the whole "Super Hornet" program was sold to Navy and Congressional leadership, it was touted as "an upgraded version".
Which made it seem low risk - it's just an upgrade, right?
There was some heavy pressure from SECDEF to kill the F-14 Super Tomcat (he did not like Grumman, long story, involving politics and personal feelings). The Super Tomcat used the same airframe and engines as the F-14D, which was then in production.
That was actually the low risk option - same tooling, same production line, common parts.
But the Super Hornet was cleverly marketed, and the Navy and Congress bought it.
The "low risk" airplane, that had new engines, new wings, new fuselage, new landing gear, new tail section. In other words - it had absolutely nothing in common with the previous airplane, and many issues were discovered during flight test - because they were testing an all new airplane.
"Low risk" and "upgrade" became a running joke among those that could see through the eyewash