I think the issue here is that as nice as you might find your VCS tools when you write code, the code you are writing, particularly on code bases that are alrea

I think the issue here is that as nice as you might find your VCS tools when you write code, the code you are writing, particularly on code bases that are already old, may survive significantly longer than the current hot VCS. If the entire commit history gets squashed when the code base is ported over to a new VCS, then VCS history may not be robust enough to communicate with maintainers in the distant future (that is, potentially a decade or less from now given the typical half life of these sort of tools).