I feel it's a lot more alpha related than delta, although it is a delta thing to an extent. Alphas seem a lot more about emphasizing fun and that things don't have to be a burden. Some of the more alpha-leaning deltas also seem to espouse that idea. I get kind of put off when there's too much focus on fun or feeling good when it comes to accomplishing goals. I think there are other theories that address the topic better though.
You do make a good point, maybe coz as negativist the LSEs are least likely to espouse this attitude, yet plenty of SLI will display this attitude in their behaviour if not in exact same words. All in all i'd say it's split between delta and alpha.
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They asked the fox, "Who's your witness?" The fox said, "My tail!"