It makes sense in the context of the premise, but it's still a poor way to introduce characters to the viewer.
Then it's even more inexcusable that SS did such a bad job of introductions. In fact it's good that you brought up Slipknot and Katana, who I surmise are full members of the comic SS but are totally incidental to the film. In fact I'd argue that the movie would actually have been better off without them, especially Katana, whose movie presence was incredibly contrived and pointless.
On the other hand SS won more Academy Awards than all the MCU films put together, so there's that.