I have been playing sins diplomacy and c&c Kane along with each other. I can say one thing for sure. Whatever sins requires whether improved ai, new ships or Blah blah. It certainly does not require a campaign. Here are the reasons, why.
1. Both C&C and sins start with few units.
2.In c&c one can colonize new tiberium fields and start new structures. But your entire battle group along with enemy is
cramped in one small map. While, in sins, you can colonize new gravity wells. You have to decide intelligently which is the
best choke point for battle fleet placement.
3. In c&c, you can win usually spam one big unit like mammoth, flame tanks or scrin air fleet. This spamming unit tech is
ineffective in sins . There is a very good counter to each unit spam from bombers to Missile ships and heavy cruisers.
4. In c&c, you cannot retreat. You can do that in sins.
5. Each c&c map will start with pretty much the same story and objectives. In sins, situations are dynamic for gravity well.
(i). Which is the best choke point. (ii). Which one is heavily guarded. (iii). Which one is soft corner.
6. In c&c super weapons are overpowered. In sins your well balanced fleet is your super weapon. Novalith, Kostru and advent
super weapon are only supporting.
7. Each sins battle require to commission or decommission certain kinds of ship. This is the most dynamic feature of the
game. It means that each battle requires a different battle-plan and thus a sin proper skirmish consists of multiple
campaigns or battle stories .
8. Playing one sins small map with star bases. You can take days if not weak. In c&c it is a one day
8. There are only two game that match sins diversity in my view.
(i). Total war series. (Love to have a turn based element in sins). Though fleet jumping between gravity wells are similar
sending fleets to different countries. Retreat is not always an option. In total war, can your fleet rest and recover?
which is realistic and possible in sins.
(ii). Supreme commander (very much similar to each other). Sins is superior because of random map generation.
In the end sins do require colorful cinematic videos. They help you to involve much in game. I think that even fans can
make them (though require a little effort).