They talk way too much.
They could get twice as much done without explaining to us what they're going to do.
Though, it would ruin their corny charm.
"...death is suddenly a perceptible thing to me with definable features."
Excellent comment, however I have two answers.
1. It was a kids show - trying to explain the actions of the super-heroes in full detail. There was no need for any mystery or subjugation of what the characters were doing. So, they just explained everything outright.
2. Animation is a slow process and expensive. Just like plays back in the day, dialogue takes up little animation (a few mouth movements) and moves the plot along just fine... according to the philosophies of animation studios back in the day.
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"Have a good time. ALL the time. That's my philosophy Marty"
Budget was the big thing. You didn't need as many in-between shots for dialogue scenes. Filmation got around this in some of their later cartoons by using rotoscoping (animating over live footage), though they relied a lot on stock shots.
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