system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek TNG era] If Starfleet devoted every resource to war, how big and powerful could its flag ship be?
gpt
In the prime timeline, when Starfleet experimented with a pure warship, we got the Defiant. The idea was not to build a huge, grandiose vessel because it would just end up an easy target for the Borg or other hostiles. Instead, the philosophy of the Defiant was to overwhelm the enemy with small, impossibly fast and powerful ships. Had the Defiant project gotten off the ground, it would have heralded a flurry of construction of these little overpowered monsters. Remember how the most exploration-focused Starfleet ship can often hold its own against warships and other combat-focused vessels? A fleet of Defiants would tear it all apart. 

In the Kelvin timeline, granted it was still many decades before the 24th century, the USS Vengeance was the pinnacle of Starfleet's offensive capability and supposed to be the herald of a Starfleet that was ready for war with the Klingons. It was a true monster, with the complete opposite design philosophy of the Defiant.