I too, thought Yoda strained too much with the pillar. The reason being, of course, so Dooku could escape. Had Yoda realised he could just yank Ben and Anakin to safety, Dooku wouldn't have made it to his ship. A neccesary plot-hole. Also, jimbo, models own CGI. Always have, always will. You forget that all the CGI ships in the prequels were sourced from models. They build the model, scan it, photograph it, and then manipulate it in the PC. Check out Star Trek Insurrection. They skipped the models. It shows just how shitty CGI by itself is. I'd rather have a realistic model fly in a straight line, than a over saturated, fake looking CGI image doing barrel rolls anyday. Not to mention that traditional effects are much more interesting to study.