Always look for opportunities to tweak what test is already existing as opposed to writing partially duplicated tests for new specs. The reason Cucumber / Gherkin is not great is this duplication; if every feature was mapped to a spec, there would be much duplication between the specs. What matters from a test perspective is the beginning state of a test; if reaching that state is common, then it is an opportunity for a test enhancement vs partial test duplication. At which point, the only caveat becomes the test duration for parallelization concerns.