Why no function to automatically add new zones to slave servers?

[Sam M]

Please excuse if this is a subject that has been covered in depth before,
but I needed to vent some frustration so here goes.

I was just wondering why there is no function in Bind to automaticly
add/signal NEW zones to slave DNS servers? 

At the moment I have to add records to a slave zones file as well as a
master zones file and transfer the slave zones file to my slave servers
using a third-party transfer method e.g sftp, https or configure the slave
servers to transfer the slave zone file from the master server at regular
intervals.

It seems to me this really makes things far more complex than they need to
be. It does seem strange that such a vital part of the DNS setup
(Redundency) has been left to be bolted on in such a haphazzard way.

I've heard some mention security issues, but I don't see why that can't be
overcome, surely it can't be as bad as having to resort to some third-party
method which is probably more insecure than building a properly secure
method within the bind program itself.

Maybe im missing something and it can already be done like this. I know that
some DNS server software can do this e.g. SimpleDNS on Windows.

Yours, lost and confused.

Sam