Yes but its lemmy, how do you expect people not to flex with the least obscure language history fact that exists? I think its cool if youre into that stuff(i also like languages and etymology) but yeah dont make it needlessly complicated for others. Also i dont think it matters whether youre native or not. Id say theres probably a larger share of germans who know what they are than americans. Lastly, it is extremely funny how you said that eth and thorn were already used in confusing and random ways when it was a part of the alphabet. The same way th can be voiced and unvoiced thorn and eth can also be voiced and unvoiced.