So there is a certain sizes of modules used for certain ships. For example, small turrets go on frigates and destroyers, medium ones on cruisers, large guns on battleships, and so on. Part of this is due to certain ships getting bonuses, like the Thrasher’s bonus only applies to small projectile weapons, not medium ones. But in other cases, there are no bonuses, but following the “conventional” sizing pattern is what generally makes sense. Three 650 mm Gallium cannons on an Executioner might look cool, but unless the next patch comes with a bug, you aren’t actually going to fit even one since the power grid is 54. A battleship could use medium turrets to deal with cruisers, but why give up that DPS?
Now it comes to Armor plates. I get larger plates are easier to fit on bigger ships, but I don’t get which one “generally” goes best with which class. Which one is often used on destroyers? Going by the fact that they use the same guns as frigates, the 100m plates seem logical. But then in my simulations, the 200m plates seem to fit on them fine and these obviously offer better armor.
Also I find it goofy that Resistance Coatings (already inferior to hardeners) can often in the simulation give more EHP than 100m or 200m armor plates in the simulation on a Dragoon. Which means not only do the resistance coatings allow you to tank more damage, but if you for some reason survived multiple hits (instead of either not being shot at or just blown up when you were shot), you waste less downtime having someone repair you. I would have thought since plates increase EHP and resistance coatings increase EHP and make repairs more efficient, plates should be straight up better at increasing EHP.