The writing on P+ was...different. In the earlier goings (and well into their years, to be honest) they had the word order reversed, in my opinion. One such puzzle might've been SPOTS, DOG, BREED, FIREMEN, DISNEY in that order, which would result in a fairly easy two-clue solve. Played in reverse, it would've come together at the 3rd clue, maybe not be solved by the 4th.
By the middle of Kennedy's tenure (I got this from an ep. I caught of the Steve Allen/Jayne Meadows week) the five words to the puzzle didn't exactly lead to a succint answer, which made it seem like playing the main game all over again. In that episode, a ridiculous amount of puzzles went unsolved.
I loved the SP writing because they chose some great passwords. I wasn't always crazy about the impossible-until-the-fourth-clue puzzles, but spicing up the password play was cool with me. On the plus side (tee-hee) P+ had the easier words, but the play/pass option to make it more interesting.
To get back to your original question - I dare say you may be right. There's more to making your mind work so you can communicate an idea in as little as one word. Although my dad quite rightly said how tough "Pyramid" really can be and how easy the regulars made it look in the 80s. Being able to zero in on one term with a sentence, much less 7 within 30 seconds is a good exercise in vocabulary and using your words wisely. The endgame in particular - finding that one perfect clue to transmit "Things that are Narrow" takes some out-the-box thinking and a deal of intelligence, IMO. Although "Jeopardy" is at least a step above an average trivia game, because the writers often give you several ways to arrive at the answer - whether it be with two definitions in the clue, or by using the category and a vague clue in tandem.
-Jason