Github user dkuppitz commented on the issue:
https://github.com/apache/tinkerpop/pull/486
The `PathProcessor` interface has no function for SimpleStep and doesn't
add any overhead. AFAIK `PathProcessor` is only used by strategies to easily
identify traversals with "special requirements". Both, `SimpleStep` and
`CyclicStep`, access the current `traverser.path()` and thus they **process**
the **path**, which makes them `PathProcessor`s :).
I can also rely on the result of `getRequirements()`, but this would make
the strategy a bit slower and I really don't see why `SimplePath` and
`CyclicPath` should not be `PathProcessor`s.
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