Knowing about something and implementing it are two different things. The wealth tax was actively suppressed by the wealthy and there was no democracy to appeal the decision of the decision makers. Your idea that a thing exists and therefore it is now the new normal is naive.
Seeing Westerners rediscover wealth taxes is kinda funny when Muslims have all this stuff in a 1400 year old book.
Knowing about something and implementing it are two different things. The wealth tax was actively suppressed by the wealthy and there was no democracy to appeal the decision of the decision makers. Your idea that a thing exists and therefore it is now the new normal is naive.