There should be an option for replacement of an object so we can replace an object on all artboards with global edit
Janaid, you can do it now, with a small limitation. It works in 90%, because Ai has some legacy limitation on types of objects to be used in Global Edit, because it’s based on creating a temporary symbol, and symbols still don’t support live text and images, placed or linked. Meshes are OK, strangely.
To replace an object using Global Edit, copy the thing you want to replace with, then select the one copy you want to be replaced and enter the mode. Then isolate the chosen object (Isolate Selected Object button on Control panel or a custom assigned hotkey) — this will allow you to paste the replacement and delete the old art. If you delete first, Ai exits the mode, so paste first, delete after, then exit.
Now you have your object replaced.
There is also another solution to make it a bit simpler — the Global Edit to Symbol script by the brilliant Takashi-san:
It is a paid solution, but if you need this often, it might worth it.
Please comment back if it works for you as a workaround.