Like it was said in two separate posts earlier - lack of innovation and EMC happened. Face it - on the Dell side, there are only so many ways you can take an Intel processor and package it to look innovative, and the tech world has evolved to where that stuff isn't as important anymore. Sure, the VXRail shills will claim they are moving the needle on the future, but at the end of the day, it's all repackaging stuff that already exists and calling it new - a hyper converged chassis with VMware for software. As for EMC, their flagship product that built the company is based on a technological approach from the 1980s. Note I addled "approach" there - they did evolve to Intel processors and Infiniband, but the method of how the array is implemented, operated and grows is still rooted in how it was designed to support mainframes...not very agile in today's data center. And, any other company their former CEO bought was simply to be a gateway to selling VMAX.
EMC also happened in the dimension that the merger brought in the vilest, most repugnant sales force in the tech world, headed up and deified by a guy who would sell his family's soul if it meant hitting a number. Sure, they will call it "results-oriented" and "world class", but once you start peeling back the onion on how the EMC salesforce truly operates to make a quota, you'll want to take a shower to keep your morals clean.
It's the sad truth, but Dell EMC is becoming the Walmart of the IT field.