DIP54 : revamp of Phobos tuple types

[Dicebot]

On Monday, 23 December 2013 at 12:03:05 UTC, ilya-stromberg wrote:
> Can we add alias for `auto-expansion TypeTuple` and add link to 
> the previous documentation like this:
>
> alias ExpandedTemplateArgumentList(T) = 
> TemplateArgumentList!(T).expand;
>
> It looks like it can fix all objections here.

What is this supposed to give over just using .expand directly? I 
have not seen a good rationale that justifies it among existing 
objections, probably have missed it.