So we get a very expensive, old but updated two seat fighter (a great airplane in its day), and then put only one crew member in it. WTF?
Hmmm. The F-15 was and remains a single-seat fighter.
The F-15E is a two seat bomber because of the increased workload, but modern weapon systems make a single seat multi-role version, as with the F-18E, more than practicable.