People don't seem to complain about the HK45 only being 10+1. The FN45 is huge even compared to the HK. Also it is much easier to make the mag well bigger in a polymer.
Personally I do not feel the need to pay $1000+ to gain 2 rounds.
"Its a tool box... I don't care you put the tools in for the job that's all..." Sam from Ronin
The United States is a nation of laws: badly written and randomly enforced. -Frank Zappa
Without deviation from the norm, progress is not possible.-Frank Zappa