There’s already a compatibility layer and it works really well. Most android apps run fine on Linux. The big problem is Googles security layer which is also what causes problems for alternative Android builds like GrapheneOS or PostmarketOS. That prevents you from running certain apps (mostly banking but notably also includes Google Wallet preventing tap to pay) on devices with unlocked bootloaders as well as Linux. Any non-official version of Android, or even an official version running on a device with an unlocked bootloader is going to have a problem.
Beyond that having tried a Linux phone as of a couple years ago it had significant usability problems such as unacceptably high battery drain and the inability to receive push notifications when the screen was locked. Some of these issues may have been solved since the last time I tried it, but at the time the experience wasn’t one I would recommend to anyone nevermind the average person.
There’s already a compatibility layer and it works really well. Most android apps run fine on Linux. The big problem is Googles security layer which is also what causes problems for alternative Android builds like GrapheneOS or PostmarketOS. That prevents you from running certain apps (mostly banking but notably also includes Google Wallet preventing tap to pay) on devices with unlocked bootloaders as well as Linux. Any non-official version of Android, or even an official version running on a device with an unlocked bootloader is going to have a problem.
Beyond that having tried a Linux phone as of a couple years ago it had significant usability problems such as unacceptably high battery drain and the inability to receive push notifications when the screen was locked. Some of these issues may have been solved since the last time I tried it, but at the time the experience wasn’t one I would recommend to anyone nevermind the average person.