I agree with you. Chernobyl does not need CGI. It is such a good show that I have not stopped talking about it since I saw it. if you ask me, the series achieved the same as the suicide of the physicist Legasov, an interest in the matter that the Russians do not like. it means for them to reopen a wound that was closed. I even knew that they are planning their own version where they will talk about the USA's participation in the catastrophe.