J.Fine wrote:
> Perhaps you'll find, when you remove 'TeX macros' from the requirements specification you'll find that it's better not to use TeX macros for the implementation.

Fundamental point, of course, but the current plan is that LaTeX3 will
work with pdfTeX, XeTeX and LuaTeX. If we were going down the ConTeXt
"LuaTeX-only" route, then I'd quite possibly agree. But we're not (at
the moment!).
-- 
Joseph Wright