I can tell you from doing testing on Edge back when it represented a potential third engine to support: that browser crashed a lot. It was very unreliable prior to switching to becoming another chromium fork. It is clear the dev team was either underfunded or plain incompetent and Microsoft was in dire need of a default browser that didn't make people wince, ASAP, they could not afford to wait [insert X years to get a mature engine] so they went the obvious route and chose to make a chromium fork.
Making a reliable engine that supports all of the modern web is a monstrous undertaking. Not just "support", it needs to be reliable. Microsoft missed the boat when they allowed IE to rot and it was too late to catch up now. Every year spent without a reliable browser preinstalled on your OS is detrimental.
Making a reliable engine that supports all of the modern web is a monstrous undertaking. Not just "support", it needs to be reliable. Microsoft missed the boat when they allowed IE to rot and it was too late to catch up now. Every year spent without a reliable browser preinstalled on your OS is detrimental.