In my opinion, there should be basically two types of complaints: those for CBSA detentions and those for the land border.
At the maritime border, there are very few interactions. When arriving in the country by plane, and you are neither Canadian nor American, you have to fill out an electronic travel authorization. Abuses of power are therefore less likely to occur.
It is true that CBSA officers have extraordinary powers, but those powers are comparable to those granted to most of our partners in democracy.
In fact, entering a country is a privilege. When people have to interact with the country's police, I think that type of interaction is different, because they've already obtained the right to be in the country. It could explain some complaints filed against the CBSA, which previous witnesses talked about.
Complainants have experienced very serious personal consequences, such as being denied entry into the country. If a person whose phone gets seized thinks it's not warranted, for example, they have to wait for the CBSA to give it back to them, and too bad if it takes months.