I mean, I agree that developers shouldn't feel entitled to have all potential visitors using the most up-to-date software, but it is also definitely true that there is almost never an excuse to be using a web browser that doesn't automatically update. Forget CSS features, it's a pretty big security concern.
Representing the very people who have the capacity to spend millions of $$ on my product.
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.
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.
Uh huh. And how many years did it take to actually get Flexbox and CSS Grid? I mean...They're both still "Candidate Recommendations" in 2019. That's not even the penultimate level of recommendation. You definitely can't use Grid if you want broad compatibility; it was only first implemented in 2017. "People should update their software to the latest versions! And they should switch browsers to use one that supports my nonstandard features!" Oh, yes? Well they don't. And let's not even talk about Grid Level 2 which is implemented nowhere. We've gone through generations of faking markup with javascript because the dogma behind CSS has always been a terrible mess. "No tables for layout!" Ok, what else are you supposed to use to arrange things in grids? "Uhhh....give us a couple decades to get back to you on that."
When people say that CSS is terrible, they mean the actual standard parts, and they mean for the past 22 years.