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There's a partial answer here and some discussions about it in ament git

From my understanding : In order to detect that a package is installed, ROS2 needs to install a marker file. Similar to installing the packages manifest in ROS 1.

So I guess if that marker file didn't exist in the share folder, the ros environment couldn't find the package and we couldn't call the ros2 launch XXX or ros2 run XXX. And it seems that the only way to generate that empty markfile at compile/deployment is to create it in src folder then transfer it to the share folder.