Comment by Kim_Bruning

In a semi-random sample of 10 recent articles on arxiv.org, 10 articles (100%) contained english language as the predominant part of the corpus. Where necessary mathematical notation was included.

So - you're not wrong that eg. mathematical notation is (often) used, as we both very well know. But English is really quite prominent!

And now computers can process both, where before they couldn't.

The engineering doesn't go away, not yet. Decomposition, abstraction, state management, blast radius containment O:-) . But now you can express much more of that in the language the arxiv papers are already written in.