If you have been pushing into higher and higher levels of The Pit in Diablo 4, you may be starting to run into a problem: survivability. While yes, you can glass cannon your way through many situations, you will end up in places where one wrong move is death, and this is even worse for closer range builds and classes.
Then there is the Paragon Board, which includes very important nodes to increase Max Life. The most important are Tenacity Rare nodes which can give you 12% Max Life if requirements are met. Then, they are usually surrounded by 2% Max Life blue nodes. Once you really start scaling, even a 2% node can be something like 8,000 extra life.