John Browning's design didn't survive 100 years because it was bad. There are two specific reasons for a grip safety. The first is obvious .... safety. The second is to insure the shooter grips the gun properly so it will be accurate and won't malfunction from torque. John Browning's commercial model design included a grip safety 6 years before the Government bought it and gave it the 1911 designation.
Actually, there have been quite a few guns made with a grip safety to include S&W revolvers. Considering the 1911 was designed to carry cocked, locked, and the chamber loaded, the extra safety margin from the grip safety is a very good idea. Some people just don't like anything that has "safety" in its name and want to disable them. When you train properly, it's almost like the grip safety isn't there. You have to learn how to draw and grip the gun, then everything else falls into place.
Questor, Please name just one gun that has a more robust design than a 1911. No gun on the market has aftermarket support like a 1911. The 1911 can be configured for plinking, bullseye, combat, tactical, pins, plates, etc, and makes a great carry gun. You can buy a host of different sights, grips, barrels, thumb safeties, grip safeties, slide locks, hammers, triggers, magazines, and more. Granted, one configuration does not fit all needs but changing a few parts can taylor a 1911 for any handgun use.