Many examples have been given for why this is *false*, and they're pretty much all tied to the *non-removability* rather than the non-modifiability. Should we repeat them again?
I've looked at these reasons, and they did not convince me the first time; repeating them won't convince me now. Recently I have started sending mail discussing the issue, explaining why this is too strict a standard. This is the point on which Debian has consensus and cannot compromise. You seem to be anticipating a decision which has not yet been made. I doubt I can convince you, but I hope I will convince other Debian developers to reject this proposal.