Personally i will wait and wish for Kazuha because I couldn't get it on my main. He's not essential i think when you have venti or even c6 sucrose, it matters on what comp you are using. Kazuha is a jack of all trades, master of none. Can slightly group enemies pretty frequently, but not as good as Venti. Can provide damage boost support, not as good as Sucrose. Can do decent Dmg, not as good as Xiao. HOWEVER, because he is an all-rounder, he can support/fit into almost ANY team comp and he's extremely fun to play you won't regret it