I'm about to travel to canada on work and as i understand it the last step in the visa is an interview at the port of entry where the border guard can decide if I get to stay or not.
Interesting, it was the opposite for me, US citizen with CA work permit circa 2016. CBP seemed to not care while CBSA was often irrationally aggressive and suspicious. The closest thing I got to an explanation once after being freed was “We just like you” with a grin.
I was grilled in Vancouver about whether the purpose of my visit was work or pleasure, after I helpfully told the officer that my dad was attending a work conference and I was traveling with him but sightseeing.
"Well which one is it, work or pleasure?!"
I don't know, dude. I just explained the situation: you're supposed to be the expert!
https://laws-lois.justice.gc.ca/eng/regulations/sor-2002-227...