You're right that the difference isn't overly obvious. However, for most services, Wants= is enough. I think some of these (like Requisite=) came from actual users' demands where they had to solve corner cases in their setup that systemd did not allow with the existing features. I think especially UpheldBy= is a smart addition; it adds restarting to a service only if that services is used as a dependency for the one it upholds.
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