And Sony forces you to buy their own expensive E-Mount lenses?
To be honest, Canon EF mount lenses are probably the best buy if you are looking for compatibility: there's adapters for Sony E-Mount, Canon RF-mount, etc.
The reason RF, Z, and E mount exist is because you can make the camera body much slimmer in MILC.
It's much easier building adapters for lenses going from DSLR -> MILC. It might not be possible to go the other way around.
To be honest, Canon EF mount lenses are probably the best buy if you are looking for compatibility: there's adapters for Sony E-Mount, Canon RF-mount, etc.
The reason RF, Z, and E mount exist is because you can make the camera body much slimmer in MILC.
It's much easier building adapters for lenses going from DSLR -> MILC. It might not be possible to go the other way around.