in this thread we discuss why moe is trash and why realistic art styles are objectively superior
Stop watching anime
Clannad was still popular as a VN before it was an anime, I think.
It's not about Clannad itself obviously, but the garbage it spawned after its success. Anime trying to emulate its success by using the same art style.
I won't deny that anime has gone downhill since 2007, but I wouldn't consider Clannad to be the start of the moeblob trend. An early example, maybe, but there were plenty of others around the same time.