Message Lib instead of Mail only ?

Hi, 

I wan't to open one thread about the Mail system in CI 4. 
Those days sending message / notification is possible not only by e-mail but and by many other gateways "SMS, 3rd party apps (FB, Google, etc..)"

Wouldn't it be better if in CI 4 instead of Mail library there is Message library with email as the only base supported gateway ? 
This way anyone will be able to add any kind of message gateways and to use it by standard framework class/methods following just a base driver interfaces..

In most of the cases a Message (mail or other) has very common things : Sender, Receiver, Message, Attachment.. 
Of course there will be some differences as some of the gateways will require to be authenticated (maybe some key or other) but this will be handled by the drivers and not by the base Message class..

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