The business case for native apps (whether on desktop or mobile) is that it's not just another tab people can X out of. Installing a native app feels like a commitment. The icon is there. It might be sitting in the tray/taskbar. It commands attention. It can push notifications that most users wouldn't turn off.

Most users do not know what a PWA is and won't install it unless it was done for them. Even then a PWA is at the mercy of the host browser's configuration and addons which can degrade the experience. (And on Apple devices it won't even work.)