Nor would many of us argue that more Raptors should be produced WITH the upgrades in them.
Nor would many of us argue a modified Raptor FB model for the USAF's new bomber program.
The expensive part is paid for, why not utilize it.
If you spend $150 setup fee to get T-shirts printed, why would you only order 10? Likewise if you spend $60B on on setting up a fighter program, why would you CUT your order to 187 and drive the costs way up?
We have the cookie cutters, why not make more cookies?
If we're selling the freshest cookies (with more goodies) to the entire planet, why not sell our 'older' cookies to others as well. If they got the $$ we've got the baked goods!

TEG
[Airplanes are] near perfect, all they lack is the ability to forgive.
— Richard Collins