Personally, I'm not aware of ever hearing Sam explicitly state why. But my assumption has always been that it's essentially "because that's how IMAP and POP work with the folders." Neither IMAP nor POP will actually delete messages from an active folder without some other "confirmation" action. In the case of IMAP, an explicit "EXPUNGE" command must be issued after the deletion to really delete the messages, IIRC. And in the case of POP, I don't believe the messages are actually removed after being marked as deleted, unless a successful "QUIT" command is issued to end the session.
There's another reason, and a more important one.
You are reading the first message in the folder. You see at the top of the screen: "Message 1 of 6".
Suppose you've decided to delete it. After pressing the delete button, sqwebmail deletes the message and goes to the next one. Question: what do you expect to see at the top of the screen now:
"Message 2 of 6"
or
"Message 1 of 5"?
Which one of the above actually makes sense, and which one is going to confuse the hell out of everyone.
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