That's a double-edged sword. On the other hand, TeX isn't changing much which, given it's space, is necessary: (La)TeX can still typeset documents written in th

That's a double-edged sword. On the other hand, TeX isn't changing much which, given it's space, is necessary: (La)TeX can still typeset documents written in the 90s. If you would start shaking those foundations, you are in a world of pain, probably.