en.wp user Andrew Gray notes that on creating a page in VE he is given several alternatives to writing a new article, one of which is to search for an existing page to redirect the title to. He asks whether this should be offered to VE users while it does not support redirects.
However, the message is provided by [[MediaWiki:Newarticletext]] and the text is served identically in the source and visual editors. There is no current mechanism to detect in which editor it is being displayed so different content cannot be provided.
There will be occasions where such messages and also edit notices are only relevant to either source or visual editor users or are differently relevant. In other cases the different display formats (e.g. generally horizontal in source, generally vertical in visual) may lead to different presentation choices for optimum impact.
As it is not inconceivable that there will in future be other editors (developed by WMF or others) there should be some way for the editor to uniquely declare itself to such messages and for them to be able to determine what they do if they don't recognise the response. Sort of a:
IF editor="VisualEditor" THEN do X ELSE do Y