There is significantly more moisture in the atmosphere now meaning the storms that el nino brings will have a greater capacity to cause flooding. The water the piles up on the west coast of north America will be in addition to the sea level rise that already occurred. Making coastal flooding worse. A drier winter in the Pacific northwest means less snowpack and therefore less water available in the summer with global warming this is exacerbated by the loss of mountain glaciers which help balance seasonal variability. Heating the western Pacific means el nino has always been bad for fisheries there, but layering it on top of global warming can increasingly devastate fish populations there.

Our infrastructure and agriculture are designed around a climate regime that is increasingly becoming a thing of the past. I think your attitude about this shit is nonsensical

The moisture is a side-effect of the additional energy in the atmosphere - warmer gases can hold more water vapour.

And that's the thing - our climate is a massively complex system of interacting systems, and now we've put more energy into it, and it'll show up in the variability.