What is the way to go in hobby robotics today? I'm more interested in high level, and want the lower level to 'just work' with minimum efforts from my side. Having mechanical part and vision what would be the right choice for low-middle software to control robotic arm and car, may be attached one to another. ROS2?
I’d say start with a sumo robot, line follower, or maze solver. That’ll keep you very entertained for a good while.
Another interesting option is Raspberry Pico * N + Tiny PC. For control and thinking. They can be connected via wifi or blutooth.