There's a light at the end of the tunnel. Once IE 11 is mostly gone, everyone will be on an 'evergreen' browser that auto updates. Once we're there, new features won't take 10 years to be usable.
Unfortunately, I don't think it's fair to call Edge evergreen. Updates to Edge come via OS updates, which can be quite a hassle and many corporate environments might not perform at a regular basis.
As I said on another thread - the problem with that is that Windows 2016 server launched with IE11. So the flagship server OS for the next several years won't support Edge, which is why I'm sitting in enterprise Citrix deployments in 2107 trying to make IE11 work.
I hope we don't still have to make IE11 work in 2107, but considering how often some enterprises seem to keep ancient software around, it just might happen. :)