Just my personal experiences moon, but for a revolver, you need to push 500 or more rounds thru it before considering any modifications. Wheelies need more break-in time than SA's. Depending on the wheelie you buy, sights are usually the first thing done, and are upgraded, if needed, long before you get to the 500 number. A lot more can be done other than just a trigger job. It just depends upon what you want to do with the gun, and how much you want to spend.
To make a generalized statement that "most 1911's seem to need something or other before they can be trusted 100%" is inaccurate.
I have personally never felt a need to modify any of my revolvers, beyond grip and sight swaps. Most modern revolvers don't need their timing adjusted, or their triggers worked on, or to be melted or ported or what have you. Yes you can modify them. No, you don't have to in order for the gun to be perfectly serviceable.
Please allow me to modify my original statement: "
In my experience, most 1911's seem to need something or other before they can be trusted 100%" I have personally had more problems with the 1911 platform than with any other. Obviously, there are thousands, if not millions of folks who hold the 1911 in the highest possible regard, and bristle against any perceived attack against the platform. The 1911 is not for me- but to each his own. My Dad is a 1911 guy, and swears by them. He also works on his guns a lot.
I would not recommend a 1911 to someone who wants to pick up a gun at the store, load it up, and toss it in a drawer as protection in case someone breaks into their house. 1911s can be picky about ammunition, limp wristing etc. Sure, many are good to go, but there are many that need work. There is a huge range of quality in the 1911s on the market. Some are exquisite, some are trash. Generally, the more you spend, the better you get, but this is not always the case.
Ideally, anyone who purchases a gun should spend a good amount of time at the range wringing the gun out and figuring out its quirks. But not everyone does this. For someone who wants to buy a gun that will absolutely, 100% go "bang" the first time the trigger is pulled, no matter what the situation, no matter what ammunition is being used- I would recommend either a Glock or a Smith revolver.