I think sera t2 naval has been weakened too much. Consider the following:
Destroyer beam damage (contrary to the database) has been reduced to 190dps, with 125dps coming from the front gun and 65dps from the rear. The previous numbers were 117.5dps front and 105dps rear, for 222.5dps total, a reduction of almost 15% overall, but 48% to the rear gun dps (most of the damage done while kiting). Compared to the main gun dps of the other factions (aeon: 212dps, cybran: 230dps, uef: 275dps) this is notably less. Although they benefit more from micro, they are also much less effective at damaging small targets and inland targets in general. Combined with 20 less range than aeon and cybran, lower hp than uef and aeon, and no other other t2 support ships besides cruiser, it's easy to see situations where they would be notably disadvantaged.
Regarding torpedo warfare, sera destroyers fare even worse. Contrary to the database, the actual torpedo dps is just below 107. This causes them to lose to equal mass in cybran t2 subs and even equal mass in uef t1 subs. They can edge out equal mass in aeon t2 subs when numbers are low but quickly lose this advantage as they grow. Submerged destroyers lose to cybran destroyers, get obliterated by aeon destroyers, and ofc lose to similar mass of coopers.
When you couple these weaknesses with the game's worst torpedo bombers and gunships, as well the worst t1 subs and arguably the worst frigates, you end up with what I would call an unacceptable vulnerability in some scenarios.
This post is intended for people that are experienced and thus qualified to review it and reply with their own fact-based opinions. Please consider this prior to responding.