Yeah, these are pretty bad in my opinion.
Really the only solid use cases i see for any of them is the 7A fitted to either a Corvette or a T9, in the Corvettes case to make it into a 'do any mission' ship and a res zone mat gatherer, or a mining ship with either the T9 or the 'Vette.
Adding engineering to them would certainly help, but offering them in all classes is needed for anything except the 7A universal to be really at all desirable, at least to me.
Yeah, there is that edge case of getting 4 collectors in a size 3 slot, but.. to be honest, with a carrier, id rather just have good quality limpets and a bit less cargo space on the mining ship.