Recently we've been going through the browser stats on our websites, and while globally apparently IE is dying, it's certainly not dead yet. In the specific industry I work in (Heavy Automotive Retailing, eg Truck Sales and Servicing), we see upwards of 30% of our users on browsers <= IE11. All of our sites are getting poor lighthouse scores on performance with the main suggestion to be changing to webp, but that would exclude 30% of our customers.