A weapon that can't be maintained properly will fail, it is only a matter of when. To get to the beretta's firing pin you have to take off the rear sights and numerous small parts of the safety and I forget what else. To make matters worse the assembly process is different than the dissassembly. There are two or three steps that have to be done differently. I bought an AGI video to show me how.
A complete detailed strip usually isn't required too often. Let's also not forget that the US military has armorers as well.