It's hard to tell if they neglected the original Edge or if they just couldn't keep up with Chrome. IE was a completely different story, it was full of proprie

It's hard to tell if they neglected the original Edge or if they just couldn't keep up with Chrome. IE was a completely different story, it was full of proprietary Microsoft technology (ActiveX) and a lot of Enterprise applications used it heavily. Microsoft didn't care about browsers maybe 15 years ago, but this changed a lot. A lot of Microsoft software is just available in the browser, they migrated a lot of things to web technology. That's also the reason they switched their browser to Chromium, they needed to ship something that actually works.