I must be hard on my mags. They hit the ground more than they get gently lowered into my hand, at least with any guns serving in a competition or defense role.
I've yet to make a magazine unserviceable for any of these guns, and that's after dropping them in dirt, mud, water, concrete, etc. Brands: Various Glocks, HK P2000, Beretta 92fs, 1911s, and various AR mags. Typically they get a shake out and then get used again. At worst, a quick wipe down at the range before the next string of fire, then a cleaning at home.
If they were as fragile as many posters make it sound, I wouldn't be relying on that gun or weapons system for any serious purposes.