Seriously, this. I don't know the idea of CGI'ing all of the clone troopers, who are given prominent screen time, popped into Lucas' head. I mean, they aren't some huge monster or alien you have to CGI, they are literally fucking stormtroopers from the past. Was he worried that the costumes would look too plastic or fake? No one complains about how the stormtroopers looked, in fact most of us think they did and still do look awesome. The decision to CGI the troopers is painfully obvious and sad in Episode III when Obi-Wan is talking to one of the troopers with their helmet off. Instead of asking Temuera Morrison to wear a suit and stand there, they instead CGI him in there. What is the point of that? There's no way that was cheaper than having Morrison stand there in a suit.