Everything I see here is extremely interesting to me. I have never tried a single one of the dishes you mention, so each addition seems more and more amazing than the last, I can't stop picturing all the possible combinations, that gastronomic area is a fantasy!
You are right, the market appearance makes you think that they are not so old establishments, but I know that these popular places last over time. I do not know what I find more surprising, if the very low price or the fact of eating a whole plate standing, without sitting hahaha just imagining the crowd to which you refer and it seems to me a very complicated situation hahaha.
I loved this post, bon appetit!