What owners describe as holding up is the power delivery rather than any specific part. The argument several make is that running at 36v draws fewer amps, so tools and batteries run cooler and should last longer, and one owner feels the batteries hold charge well. The pole saw owner reports no issues after a couple of years on hardwood and pine. Nobody in these accounts reports a failed tool, motor, or battery.
That said, the long-term record here is thin. Each theme rests on only a few separate owners, most describing performance rather than years of wear, and none details a repair, a warranty claim, or a battery that stopped taking charge. Until more owners report back, how the LXT 36v ages is largely unreported on this page.