In the Bluetooth KCM the connect action is an icon-only button and the icon isn't self-explanatory. Since there is plenty if space next to it, it would make sense to have a "Connect" label to each row.
Under this logic, we added text to the buttons in the System Tray widgets too. I would definitely like to see this done here, but the issue is that it's using a standard Kirigami component that always uses icons-only buttons here. So we would either have to port to a custom component, or change the Kirigami component to optionally support this, and then make use of that new feature here.
Fixed with https://invent.kde.org/plasma/bluedevil/-/commit/bc5b085b38d21a90db1d7725a85f8f488d347b93.