Kurotowa
Legend
I played one, and I can definitely confirm. I had to have multiple conversations with my DM about how this or that game element should work with the echo. Can it take the Stealth action? Can it physically interact with objects outside of attacking them? It was fun to play, but simple or clearly written it is not.No. Echo Knight is probably the most poorly written official D&D 5e subclass. It's very strong mechanically, but it is worded confusingly and caused a lot of weird questions when it was released (is the echo an object or creature? Is it affected by gravity? Etc).
It very much feels like homebrew material where the DM who created it knows what they intended it to be, so the words on paper don't have to pin down all those variables and corner cases. Which is honestly why I usually stick to first party material. Creating player options that both fully interlock with existing game mechanics and are clearly explained on the page is not a simple skill set, nor is originality or creative flair a proper substitute.