On 15 June this year, Microsoft will be dropping support for IE11 on most versions of Windows that most people have access to.
There are those who say that Microsoft moving to Edge being based on the Chrome rendering engine is unhealthy, monopolistic, bad news.
I am not one of them.
For years, I’ve seen my team waste time and intellectual effort writing a web app, getting it working to everyone’s satisfaction, and then finding that it doesn’t work/looks wonky/etc. in IE11.
Multiply that by all the web app dev teams in the world, and think about the wasted effort.