Learn English – Word for “without asking for it”

Pick is often used instead of chose, so you'd more usually say 'you didn't pick the right job'. The party dress sentence is interesting - saying "I finally chose..." suggests that there was a choice of a particular number of dresses, maybe ones you own already, so you've decided between them. If, though, you went to a store and bought a dress, after looking several times at various dresses, you'd say "I finally found rather than chose.

Otherwise decide is often used, exactly as you've given examples already.

As for the appetizer, "I didn't choose..." could be replaced with "I didn't decide on" or "I didn't pick", but "my wife chose it for me" would usually remain the same, though "my wife picked it for me" might also be used.

The sentences you quote are structured merely to demonstrate the difference between chose and choose; they're all accurate, but in reality, there are other ways to say the same thing.

In this situation, I would opt for plot point. It's a well-known term (better than making up your own).

The only problem in your case might be that it usually refers to events that have a significant impact on the plot.