Servicelife vs Performance

Western airframes and engines are designed for long years of peacetime operations, upwards from 8000 hours, thousands of cycles, decades of servicelife. Russian equipment – and I assume Chinese as well – usually has only half or less of that projected servicelife.

Questions for the esteemed audience:
— Is that Western design philosphy the right way to go? Or do the Russians have a point, especially from the standpoint of the warfighter?
— Or could you gain more performance, plus save money on materials, etc from a shorter projected servicelife equipment?
— And instead replace it every five years or so, thereby having the chance for rolling upgrades via evolutionary building blocks and avoid those corn-hog-cycles?