It would actually be interesting to compare our designed ships to theoretical versions where we made all the opposite design choices.
Variant: Confederation of Earth- Project Daedelus
[NEGAVERSE] The current impulse thrusters are too bulky and space-inefficient. (Reaction Thruster -> Type 1 Thruster Prototype)
[NEGAVERSE] Focus on a small ship for short-range interception and basic patrol duty. Will require more polarisation relays.
[NEGAVERSE] Arrowhead Hull
[NEGAVERSE] Dorsal-Hugging Nacelles (+0.2 Warp Cruise Factor)
[NEGAVERSE] Midline Type-1 Impulse Thruster
-[NEGAVERSE] Small Cargo Bay
[NEGAVERSE] Six Particle Cannons (Five Ships over 5 Years)
[NEGAVERSE] CSS Watchman
REFIT
[NEGAVERSE] Do not upgrade the Watchman-class engines.
[NEGAVERSE] Do not upgrade the Watchman-class torpedo launcher
[NEGAVERSE] Upgun the Watchman-class with phase cannons
Few things were ever as controversial as a new beginning, and the new Confederacy Interstellar Design Bureau was certainly controversial. That humanity NEEDED to expand to the stars was an absolute, as the planetary enviro-grid and artificial ecosystem remained tenuous and hopes of infusing the fruits of the biospheres of other worlds to preserve Earth was a key driving factor to achieve warp drive to begin with. But the CIDB's first project would nonetheless be a defining moment for Humanity in the face of pressure by the Vulcans and Andorians in their Cold War.
To that end, the CIDB emphasized a patrol ship that would BE a patrol ship. An emphasis on small size and powerful engines, pushing the prototype impulse drive design from schematic to installation within four months, utilizing a compact arrowhead hull configuration, a tight nacelle alignment to boost cruising warp to a sustainable warp 2.4 with option of a warp-3 sprint, a cargo hold intended to set out half-full of antimatter pods to supplement the engine reserve and half of extra spacial torpedoes for the prow launcher. And to capstone the work would be six pulse-particle cannon turrets mounted across the ship for all-around coverage to fend off enemies with quantity of fire instead of weight as the phase-cannon program struggled to develop a working prototype at the time.
The early production run would find the warp core struggling to power all weapons and engines at the same time, resulting in the underpowered spacial torpedo launcher to be the more reliably usable weapon of the craft, though the reduced cost of the class would result in the initial production order of five being expanded to seven. And in terms of BEING a patrol cruiser, it was effective enough. Enduring patrol cruises, keeping piracy and trouble off the extraction lines from the first colonies, and even participating in the first engagements with the Klingons to cover the return of NX-Pathfinder-01 at the start of the Xindi crisis.
The 2152 retrofit program would consider and reject plans to upgrade the Watchman with a Warp 5 engine, citing the fuel expenditure rates of the NX-series being infeasible bunkerage for a smaller hull, and instead opted for a plan to make them a permanent garrison monitor ship by removing the unstable particle cannons for six new phase cannons and a upgraded power grid. Instead of the mobile defense envisioned and dreamed of by the Warp 5 engine, the CIDB pushed and achieved a doctrine of mass-production above all else. Ships dispatched to protect far-flung colonies would be sent on one-way deployments at warp 2.4, to garrison planets until the day they were destroyed in place or form a defensive network across the home system as the planetary enviro-grid shifted from a temporary solution to permanent state of affairs. In every engagement, Watchmen had one simple combat doctrine: close with the enemy and fire until victorious or destroyed. There was no maneuvering power or warp speed or utility room for anything else, not even escape pods.
It was a unpowered, overgunned tin can. And it would prove itself as the ship it was exactly needed to be with the outbreak of the Romulan War. Against a foe that could strike anywhere without warning, the presence of Watchmen above every Confederate world ensured some level of response was always present. When engaged it could both fight the enemy and intercept atomic missiles aimed at planets with it's aft phase cannons. And more grimly, because of the economical design choices made and the omission of the Warp 5 engine, wartime economics enabled six Watchmen to be hammered out for every NX. The orbits of every one of the First Worlds would be littered with the wreckage of Watchmen crews that fought and died for them. But those worlds would live on celebrating those lost, as the Romulans failed to nuke a single world of the Confederacy because of these watchers on the wall.
None of the Watchman class would survive the Romulan War, as the tide turned and Warp-5 ships became essential for the counteroffensives. The last ship standing- the CSS Ashigaru- would be brought back to Luna shipyards to be dismantled and scrapped, with all usable parts and phase cannons diverted to accelerate the construction of the Confederacy's first battleship CSS Yamato.