All skilled immigrants qualified for PR are professionals by definition. Your assumptions could be wrong. My impression is that anyone of any age can be a subject of report for RO. I would assume they profile a lot of younger men (man, young, foreign looking = always a threat in the eyes of border agents, and also an easy target: you can't be accused of sexism if you target a man or of age discrimination if you target the young). They are especially drawn to those who appear of middle eastern origin (you are not quite white in their eyes, while you are not a member of distinguishable minority, which also leaves them off the hook, because this particular group is not protected under any laws, regulations or customs).I do feel like immigration in Canada is more lenient toward professionals when it comes to RO enforcement. I dont know even a single case where they deported anyone who went out for education or professional career. I could be wrong. I feel like they are more strict toward elderly PRs who are in breach if RO as they have less chance to be able to support themselves in Canada and will be on social assistance. I dont know why someone who spent 10-20 years working in Canada on PR status and left for 3-4 years would be force to leave Canada on return while a citizen living and doing nothing here can go out for any amount of time. How are the snowbirds different in this sense?
As others mentioned, with Covid and wide spread travel bans, the volume of travel had significantly reduced in the past year or so, and that could be a reason why we don't hear many stories of removals or reports for breach of RO.