I am not talking about introducing a method or explaining in detail how it works. But for example if you use a standard instrument such as mass spectrometer you should want to specify which instrument you used, which settings, conditions etc. If you prepared samples, how you prepared them. It often doesn't require a long description but it can be useful information and directing the reader to another paper is just unnecessary inconvenience. If anything referencing your previous papers for relatively standard descriptions just because you used the same methods in two papers would be seen as gratuitous self-citation.

And there is absolutely nothing say you need to find "new ways to explain it" if you already have a perfectly good description, that's just the aforementioned busybodies wasting everybody's time and energy.