The thing is, TeX is just a notation as well - one designed by a guy who took care to check how that kind of stuff was expressed in real world, i.e. by typesetters dealing with math texts. As for the flexibility - meh... S-expressions are just as flexible and require as little parsing as that piece of bloat. But then *ML is The Wave Of Future(tm) and S-exp is not, so who cares that if it's vomit-inducing...
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