making-sense case to show those visa officers that my intentions for studying are serious.
Good. Because you will have to have very good reasons WHY would you like TO START your education in CANADA (and not in home country)in a field you do not have much proof you worked (working with catering for almost 2 years now, but on an informal basis).
why they provide work permits for students so that the family can be together all the time
This assumption is incorrect.
First, they do not provide OCWP for "getting your spouses into Canada". Most students are single.
Second, working 20 allowed hours a week- student could earn ap. $200 a week- not much for supporting another adult (considering that you will have to rent a separate apartment not just a room as a single student). And it is very difficult to study in Canada because of course flow , projects, a lot of reading, group work etc. So to work all allowed 20 hours a week on top of studying is very dangerous in terms of good studying, good marks and so on.