I don't know that the lowered and flared ejection port attracts more dirt ( but then I'm not sloggin thru any rice paddies anytime soon either ) with my 1911's....
I really like the modern 1911 configurations ( or improvements in my opinion )....and while I'm of an age, where the GI versions were very popular and still the standard military sidearm....I never thought much of them then - and I sure don't want a GI version now.