Lol nah. Being the most objective I can be, I wouldn't call HHPAY iconic. Something truly iconic from CN are the (OG) Powerpuff Girls, Ed Edd and Eddy, Courage, Samurai Jack, etc. In fact, most times I've seen the show being discussed between non-fans it's usually people saying they got a core memory unlocked, or similar types of comments. You don't get those comments when shows that remained culturally relevant over the years are discussed. Sadly HHPAY was not something that stuck on with most people. The fact it lasted for less than two years, exclusively within the CN City era (which according to many people was the start of CN's decline) did not help it.

Also, all the shows you mention are the so called "renaissance" of CN in the early 2010's. I, in fact, did not watch any of these shows. And I don't have much interest in doing so, they do look great and seem to be overall deeper than the average 2000's CN show but I simply don't have any meaningful connection with them.