Large chunk of "Not Invented Here", supplemented with the happy bureaucrats knowledge that any decision not taken is a good decision...... >
Most folks who slag off the bullpup design tend to either have never handled one or a best one for about 5 minutes. Typical armchair commando comments......
"Oh no.....The ejection port is reeeeeal close to my face " Obviously never used as bolt action before
"It's crap, you can only shoot it right handed" Usually said by a Righty......
"It looks too spacey" Sorry, does not compute.. :

"The trigger is really gritty" That's why God gave is gun smiths, opposable thumbs and abrasive material
"Its so short" And yet the barrel is longer and delivers more energy down range than your 11.5" incher
"Oh my God the magazine mechanism is different" Train it, use it love or loath it
etc etc etc.
I personally loved the accuracy and form/function of my L85 (and the final fixes in the A2) got to play with the Streyr Aug with the Aussies and even "played the bugle" and got serious range time with the Froggie FAMAS.
Each had it's own foibles but I like the concept.
I would LOVE an XCR in a bullpup.......