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Personally I don't find greek letters problematic. In contrast, I was traumatised by upper-case Fraktur font in older abstract algebra texts.

Fraktur is still used in model theory, but I don't believe that is easier to write than A' or Â or something like that.

Set theory has aleph א and beth ℶ which are refreshingly not Greek but Hebrew letters.

Heh, U+1D504 MATHEMATICAL FRAKTUR CAPITAL A seems to have been filtered out of my comment, perhaps because it's outside the BMP.