That's a very understandable decision from an app developer POV. But the fault lies with the OS and ideally should be solved by it. This isn't a problem on real computers.
It's like putting a toilet in every room because people can't find the bathroom when maybe the bathroom shouldn't have been hidden down in a hatch under a rug. But you can't easily rebuild your house, and now there's shit everywhere, so what is one to do?
iOS 'solved' this by including a back button in the top left that takes you to the previous app, but now I sometimes misclick that when trying to hit a button/control in the top left of the foreground app. On a small 5 to 8-inch display, there's tradeoffs for every change they make and in every stage of the design process.
It's like putting a toilet in every room because people can't find the bathroom when maybe the bathroom shouldn't have been hidden down in a hatch under a rug. But you can't easily rebuild your house, and now there's shit everywhere, so what is one to do?