IE is there for compatibility in enterprise environments. There are a lot of large organizations which still rely on older versions of SAP, Oracle and IBM applications, plus whatever ungodly niche vertical apps or in-house garbage was written back in the 90s.
Microsoft has to cater to this environment because it's been the lifeblood of the company for ages.
It's not all doom and gloom, though. I've had experience in some very large organizations, lately, which prefer Chrome. The landscape is beginning to change, but it will be a while, still, before evergreen browsers are the norm in the corporate world.
LTSC/LTSB (LTS) versions of Windows 10 don't ship with Edge and it's not possible to install it. The same goes for Windows Server 2016 and 2019.
Microsoft made it impossible for enterprises to upgrade to Edge.
And as long as Microsoft keeps shipping IE11, we're all doomed. Office drones aren't going to switch to something better until they're forced to.
I can't believe Windows 10 still has IE11.