What do you mean by 'merge 2 projects'?
There would be no way for the merge to know how to integrate one programs event logic adequately into a different project. That requires understanding what and how the events work, and a merge wouldn't be able to determine that (unless it has AI maybe).
Copying and pasting from one project to another is already relatively easy, if you follow the correct procedure.
So again, what is it you propose exactly, as the statement 'merge' is a bit broad.