So if you are doing the same work, maybe even better than a Professional Engineer, they are doing engineering work, and you are just... twiddling your thumbs?
That might be "engineering work" but it isn't the type of work that legally requires a P.Eng (or P.Eng supervision). I can have my assistant to draft a memo, even interview a client, that doesn't make him a lawyer. And he certainly isn't allowed to hold himself out as such to the public.