I don't know what the rationale for the government was, but at the time, the introduction of the ability for the minister to determine that a complaint would be frivolous, vexatious, or in bad faith was associated with the changes regarding the refusal-to-work process. If a refusal to work was made and it was seen that there was no merit to it, no facts against it, there would be an ability for the minister, through her delegates, to make a decision not to investigate.
On February 12th, 2018. See this statement in context.