The cameras that are available today, whether used or new, film or digital, offer everything anyone would ever need to take great pictures. If that's not happening, then the problem is behind the camera.
Just buy a new(er) camera body if yours is malfunctioning or somehow lacking - that's the upgrade program. By the time you've replaced image sensor, shutter, main circuit board, EVF, LCD and motors, there's not much left besides the chassis anyhow.
The OP assumes that the tech industry can agree on anything or maintain a state of technology: look how long it has taken to get to USB-C, one connector to charge, transfer data, show presentations etc etc. Amazingly, they still don't work as planned - some cables from some manufacturers will not work with PCs from other manufacturers. That's just the way it is. So asking camera makers to keep to modular parts that play nicely with each other isn't going to work.
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