Assume for a moment that all TeX literature, TeX software, TeX files etc. got destroyed in some global cataclysm. All information about TeX survives only in the mind of a few TeX gurus, or something like that.

So we would be "free" to write a typesetting system from scratch, without any need for backward-compatibility holding us back, but using our knowledge about historical imperfections of (La)TeX, if any.

What might be the main differences between the current (La)TeX and the new typesetting system?

Edit: I'm not asking "what will all the differences be" or "what controversial opinions might circulate". Rather I'm asking "what differences are likely to be a consensus". If a historical site gets destroyed, there might be debate in which style to rebuild it, but there will be consensus that fire safety should correspond to modern strict standards, rather than historical standards.

I'm asking this because I'm wondering about certain aspects of the history of (La)TeX (hence the tex-history tag), specifically how imperfections were kept for historical reasons (e.g. need for backward-compatibility). Otherwise it's difficult to understand why certain aspects of (La)TeX exist but are deprecated or discouraged from being used; why (La)TeX is the way it is (complicated in some cases); how wrong the opinion is that a simpler-to-use but equally powerful typesetting system would be possible.

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    The question is much to broad and to opinion based. Assume that an arbitrary historic site on this world gets destroyed. Do you think you would get any two architects to agree on how to rebuild it? – Ulrike Fischer Oct 20 '19 at 11:37
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    I am not sure this question is answerable in the format of this site it is too broad and too opinion based – David Carlisle Oct 20 '19 at 11:39
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    I edited the question to narrow it down and discourage opinions. Please let me know in case objections remain. – root Oct 20 '19 at 11:51
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    No need to guess anything. Just compare LaTeX with an TeX-based system build from scratch (SILE for example) and you will actually see the positive (and negative) effects of cut ties with the history. – Fran Oct 20 '19 at 14:27
  • @Fran Huh, one of the two examples on the front page of the SILE site uses ` -- ` several places in the source and does not correctly turn them into em dashes. Not a good look. – Davislor Oct 20 '19 at 14:49