Jumps are still necessary. Also, how is this different than equipping am exploration ship with a smaller power plant, distributor, thrusters, and sensors? Combat ships will be better at combat, and would actually be able to make sacrifices in the core modules like every other profession.
No, jumps aren't necessary at all. You will have your DBX, ASPX or an Annaconda for that as you can summon your Combat ship their in an instant.
Combat ships are already better at combat, they do not need to be any better. You are removing the balance that they had. As I said in an earlier post, you may as wll give all ships a 50ly FSD drive as they are now irrelevant apart from the ships with the large ranges, i.e DBX, ASPX and the Annaconda. You would not need any other ship to move around the bubble with.
All I wanted personally was module storage and maybe ship transfer that actually takes time and gives a choice on whether to go transfer your ship which takes time and costs a reasonable amount, go back and get the ship yourself (this should be the far cheaper option to balance it), or buy another ship where you are.
You are still benfiting as it takes the same amount of time as if you flew the ship there yourself, as you wouldn't need to go back and get it, but there is a cost factor, which you may not want to have.
Consequences to your decisions is important in a game, with instant travel, you lose all of that.