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Originally posted by: Zebonka
It's the same reason that the computer graphics in ANH are crappier than in TPM. The technology got better.
Or - there's no sound in space.
Seriously though, if one can ignore the lack of sound in space and accept that the Force can make people float and remember people they never met, I think mic clicks are the least of the problems.
All good scifi creates 'rules' for it's enviroment. Once those rules are established, if you break those rules, you've created a problem. These mics are such a thing.