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The implication is that we should use conventions (including potentially whole words) that are familiar to the English-literate world and not Greek glyphs.The "english-literate" world (emphasis on literate) is, or historically has been, very familiar with Greek glyphs.
And that's just for humanities.
The mathematic and physics -literate world, doubly so. Everybody uses pi, theta, sigma (e.g. the summation formula) etc symbols...