Also they basically never use space suits. They just check to see if it is a class M planet and then are shocked whenever they discover it toxic in some mysterious way.
I was recently watching an episode of TOS, and Spock beamed onto an alien space ship. The first thing he said when he appeared was, "It appears to be a breathable atmosphere," or something like that. Like, YOU JUST FOUND THAT OUT?
In TAS, they made a big deal about having personal shield that performed a similar function, but they often malfunctioned at a similar rate to the transporters and holodecks.