That becomes quite hilarious when big ships equip what could be called a "machine gun" and slowly eat ships. In starmade, weapons are linear, unlike in real life, where you can pack a lot of power into a single use item. If you scale up a weapon to the point where it would be considered a "bomb" in terms of damage, you got a corvette. A fighter in starmade is not a fighter in real life. Bombers do not exist in Starmade either, they are just bigger fighters. Bigger is better is not something you will find a whole lot of support for.
A full shield share favours large ships too much, Crusade's idea was probably the best way to do it, should it ever be added. Having to replace turrets that were shot off is part of maintenance of large ships, and will probably get a hell of a lot easier if shipyards can repair from blueprints, since turrets are a part of blueprints. Though, I admit it might just be me who believes ships should need maintenance and some loving after a fight, if I spent a long time building a ship, I get attached and will happily replace and repair the ship down to the single block (would probably make use of copy/pasta though).
The biggest argument for shared shields is the fact that you have to replace turrets (though in a faction, you should have someone for that), which may or may not even be a hassle after shipyards. If you are losing too many turrets, consider rearranging them, or adding bigger/specialized ones to protect the smaller ones from fightercrafts.