To be honest the article does realize this, first blaming it on the poor hindsight from original developer (co-founder) and in the conclusion about maybe rewriting the whole thing.
It seemed to be all about how to extract the most performance from the lemon they had to deal with.
It seemed to be all about how to extract the most performance from the lemon they had to deal with.
I found the linked reference really informative too: https://rachelbythebay.com/w/2020/03/07/costly/