Tony Bates commented on this article, but it seems to be open access, so I may as well go directly to the source. The authors ended up assessing only four systems: Zoom, Microsoft Teams, Skype, and WhatsApp. They should have considered more systems (including WebEx, WeChat, Big Blue Button, GoToMeeting, Shindig, Google Meet, Jitsi, Discord, and more) but these were the ones the authors were familiar with. This proves to be important, because as Bates notes, "they used an analytical evaluation based on usability inspection: a set of guidelines based on an expert's experience (the experts being the authors in this case)." I don't mind the method so much; it's at least as accurate as "empirical data such as students' responses or achievement", but they maybe needed a broader pool of ex[pertise to pull it off.
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