Because it's cheaper to mass produce that way.
Why do ALL current pistols have the feed ramp integral with the barrel chamber instead of the feed ramp as part of the frame like the 1911?
Admittedly a drawback, but some modern 1911's come with barrels with integral ramps. I have owned dozens of 1911's (I currently have 16) and have never had an issue with this.
Why do all current full size combat pistols have a staggered high capacity magazine (even in .45 caliber) instead of the single stack like the 1911?
Why does it take five shots to stop an aggressor instead of one? It's because you know you have all of that extra capacity. I am conscious of the fact that I only have eight rounds, and I practice accordingly. I make every shot count, not just every other one. Large capacity mags are like software. When memory was expensive, programmers wrote more efficient code, but now that it is cheap, programs use a lot more space. I don't see large cap mags as being an advantage, just a personal preference.
The 1911 is an obsolete dinosaur that the ignorant cling to out of nostalgia like their Harleys and ‘57 Chevy’s. Those oldies are cool and classic, but FAR, FAR from the best tool for the job.
The best tool for the job is the one you have with you, and the one you are most proficient with. Only the ignorant would think otherwise.
The coil spring is much more durable than the leaf. They quit putting leafs in cars.
A nine in the head beats a .45 in the vest EVERY time. Someone should dig up Wil Bill Hickock and try to convince him you should nver get in a gunfight with a pistol with a caliber less than .40. The big difference in stopping pwer between the .45 and 9mm comes from WWII experiences with military hardball ammo.