The primary function of wider arc phasers ultimately is either to improve the cost of a ship or to improve the available internal space of a ship, as it's either a matter of needing fewer phasers to achieve the desired coverage or needing fewer impulse engines so that the coverage is able to maintain fire on target.
Our decisions with the Warp Eight Engine have massively traded off on refit-capability in exchange for reduced internal space requirements, with the decision to increase impulse engine power over shield power amounting to the same thing for any given maneuverability rating.
The sum total result of this is that for the same non-combat capabilities, we need a smaller ship with fewer phasers, which aims for cost effectiveness. Unfortunately, the cost of the warp engine and the nacelles are sufficient that even with the reduced needed tonnage to maintain capabilities (and the commensurate reduction in hull and shield costs), we aren't able to build enough additional smaller ships to make up for the reduction in our overall concentration of force -- our old fleet is slower than the main timeline, because the lack of Warp Eight Engine refitting, and our sustained damage output for each ship is lower.
The confluence of decisions to improve available internal space for non-combat capabilities and reduce the per-ship cost by reducing the number of weapons haven't resulted in sufficient improvements to the overall condition of the Federation to offset that reduced overall military capacity, and is something that we need to take steps to address.
[X] Focus on Particle Density (75 Degrees Arc, 12->18 Damage)