Irwin Allen made giants look amazing. Trek pulled it off with Apollo, I think it woul dhave worked in live action. Just can't think of a good reason why they should. Why have Giant Clones?
Because the Phylosians had been giants, generations ago. It was the disease Keniclius brought to them that resulted in their relative dwarfism. By their lights they were making clones that were, at last, proper size again.
(If we're going to start holding it against Animated Trek that it puts forth a striking, weird image with an only partly rationalized in-story justification we're forced into some awkward positions with Live-Action Trek.)