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To me, the more interesting and deeper question is why Adobe software engineers decided to make the result of deleting a channel different from simply replacing a channel with all black or all white, or all gray, or something simple like that.  .  They probably have/had something in mind, but whatever it is, it's not obvious to me. 

Another question is why did they essentially set up a rule that unless one has all three channels present, you can't save the result in the usual way  (ie, the whole point of this thread).  Perhaps they didn't want people inadvertently saving images that were missing a channel, but IMHO, they could have just as easily provided one of the usual, "are you sure you want to do tthis" types of warnings.

If anyone has some insight into these two design decisions, I would love to hear it.

Regards,

Tom M