Many Android phones still have a bit of that tinkering ability to them (you kinda have access to the file system, and you can root them/flash custom android distros), but it’s quickly diminishing because (1) OEMs are locking the bootloaders, (2) it’s getting harder and harder to get hardware working without proprietary OEM hacks, (3) bank apps and other proprietary garbage that’s becoming a necessity in modern times refuses to run on an unlocked phone.
Many Android phones still have a bit of that tinkering ability to them (you kinda have access to the file system, and you can root them/flash custom android distros), but it’s quickly diminishing because (1) OEMs are locking the bootloaders, (2) it’s getting harder and harder to get hardware working without proprietary OEM hacks, (3) bank apps and other proprietary garbage that’s becoming a necessity in modern times refuses to run on an unlocked phone.