The problem with a low level cargo specialist is that your cycle time depends entirely on the cycle time of the hatch panels of your partners. Null panels will help with this but they won’t be scored.
The problem with a low level hatch panel specialist is that you only can do defense after 12 panels are placed by your alliance. You’d have to come up with a strategy with your alliance so that you don’t run out of panels to score. It is possible to be very useful to an alliance as a hatch panel specialist. Just don’t have more than one on an alliance.
However, a low level cargo/hatch specialist will always be useful, especially if you can have quick cycle times. The lower you can get your cycle times the more you stand out, especially since there isn’t any bonus for completing rockets in elims.