In 2015 I was writing a brand new web frontend for IE 5.5 on a mobile device with something like 240x360 screen dimensions (I forget the details now) for one of the most valuable companies in the world. We had complete control over the devices the users used (the company gave the users those devices). Admittedly, plans were in place to upgrade those devices, but it was still a fair bit out. I left before that happened.