I can sort of see the intention behind laws like this, but I also think it's a bit of gatekeeping. The original intention was to prevent someone who isn't licensed from providing professional opinions and from signing plans without also being accountable/responsible for the outcomes.
This is all well and good, except there are many engineering disciplines (outside of civil, mechanical, electrical... and even within them) where signing plans and providing professional-grade opinions are not the norm. My father was a practicing engineer for 30 years and has never had to sign a single plan, and so has never taken a licensing exam.
A licensed engineer typically has an additional P.Eng. or P.E. title (Professional Engineer), and I agree that that title should be regulated like all other licensing titles. But the word "engineer" is so generic that it doesn't really make sense to try to legally protect it.
Edit: According to wikipedia, there are plenty of titles in Canada like locomotive engineer used by a train operator even though the position is unrelated to the Professional Engineer license [1].
[1] https://en.wikipedia.org/wiki/Regulation_and_licensure_in_en...
That part you cited in wikipedia has no citations and may not be legally correct. This is something that is codified in Ontario law [1] (not sure about other provinces, but I believe it is harmonized federally -- in Quebec the title ingenieur/engineer is protected.). This law has been tested several times (example in [2]). More info here [3]. Even Microsoft had to give up the use of the term "engineer" in Canada after being hit with lawsuits [4].
[1] https://www.ontario.ca/laws/statute/90p28#BK43
[2] https://www.peo.on.ca/engineering-licensing-body-clarifies-u...
[3] https://engineerscanada.ca/frequently-asked-questions
[4] https://www.canadianconsultingengineer.com/engineering/micro...
also 4 is directly relating to training certs for a "systems engineer" not job titles which does make some sense, microsoft still seems to use the title "software engineer" in canada for jobs
(1-3 are not what i would consider unbiased sources)