I had to study and pass my exams in standard French with a Parisian institution. This is made obligatory by the Quebec government for immigrants if they want to stay and apply for a PR.
Anyways, the insight I want to share here is that Quebecois French is much closer to Austrian or Bavarian German vs Standard German.
Both share a similar trajectory with their standard counterparts, diverging over centuries but in the end remaining more comprehensible compared to Swiss German.
Quebecois, evolving since the 17th century from settlers' French and Austrian/Bavarian dialects, shaped since the 6th century's “Lautverschiebung” are also old but less divergent branches.
Swiss German, though also rooted in the High German shift, has veered more distinctly. Watching Swiss TV (SRF), I only get about 80-90% due to that deeper linguistic forking.
Standard Quebecois has not been much harder for me to understand than standard French. Like in Austrian German there are certain “quirks” but again much easier to parse from context than with Swiss German.
Of course there might be the case where a heavy local dialect becomes even harder to understand than say Swiss German even. German language learners could test their comprehension of Swiss vs going to a pub in Wien Ottakring or into a deep recess of the Tyrollean alps. I’d guess some encounters would be minimum as hard to understand if not harder. Same for rural Quebec etc. Then again the underlying grammar even can be really different in fundamental ways with Swiss German which is not the case for Quebecois.
TL;DR standard Quebecois is easier to understand and much closer to standard French than standard Swiss German is to standard German.
IMHO: France has just been very steadfast about language standardization up to this day and across its zone of influence. E.g. there even is obligatory standard French language learning in Quebec for immigrants and possibly public schools as well. So for some people from France they often don’t have developed the “muscle” for even slight derivations. In addition not much proficiency in “foreign languages” in general especially for older generations.