I have to agree with Panzerman.
Two cycle engines can be extremely reliable and long lived if properly lubricated. I have many two cycle engines that are 25 plus years old and some that are over 30 years of age. All still running great.
They may not be the best choice for all applications. However, in OPE, they're very hard to beat if light weight and power are desired. Four strokes are relatively tame in OPE applications. Pound for pound they make less power are generally quieter and easier on fuel. If you want lots of power and don't mind the noise, two cycle engines are best.
My preference is two cycle wherever possible. Particularly if you have to carry/push the device around (chainsaws, trimmers, leaf blowers, lawnmowers etc.). I can live with four cycle engines on devices like log splitters, water pumps, generators and any other machine that will be running long duration simply for being quieter and easier on fuel.
Other than the reliability statement, Nick R's comments are correct regarding needle bearings and lubrication.
One thing that should also be noted is the fact that a two cycle engine is much like an air pump and benefits from the additional cooling from intake air moving through virtually every part of the engine from carb to crankcase to cylinder to exhaust. That fresh incoming air entering the crankcase helps keep the internals and bottom of the piston cool.