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And the Agile developer: "Let's create unit tests, set up sprints, and refactor how we take the curve after each sprint. No matter what happens, we'll be able to deliver the car at the bottom of the mountain. Who needs to worry about how many dents it has?"
In other languages there is a distinct tense for subjunctive, such as French. In fact there are four in French. These are dedicated verb forms. They are special and specific.
In English the best we can achieve is a mood, a suggestion. We dont have distinct verb forms. What you suggest, the use of the plural form as a subjunctive for the singular, is a hack. It smacks of 18th century elocution, the same people who said you cant split an infinitive, and that hanged and hung have specific applications (they dont, they are just strong and weak forms of the past tense, like weaved and wove, dived and dove).