Computers have become an "everything machine", to do everything you want, you need multiple windows. However, things are changing. Consumers have realised that

Computers have become an "everything machine", to do everything you want, you need multiple windows. However, things are changing. Consumers have realised that it is more productive to use a tool to carry out a particular task and get the job done. They are fed up of having to wait for their PC to boot, do any updates, fix any problems and try and remember the original task they wanted to do. It's no longer acceptable. That's even before we mention the confusion of having multiple windows (think grandma). People now expect things to happen instantly so they can use a device as a tool to carry out a single task. (ie: I need check my bank account - switch on device, open banking app, check account, turn device off). This type of paradigm shift means that not only do people no longer need multiple windows, they have realised they no longer want them either. Not only that, but as we get more and more smart devices, we don't need or want multiple windows as we'll have multiple devices instead.