The Miranda-class starship was a type of Federation starship operated by Starfleet during the 23rd and the 24th century. The Miranda-class had entered Starfleet service by the 2260s, which included the launch of the USS Reliant in 2264. (TOS: "Court Martial"; PIC: "The Star Gazer" dedication...
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There is literally zero percent chance that the
Federation class, whatever choice we take now, is going to be built in numbers when the
Miranda, God of Affordable Versatility, larger than the
Excalibur class, and quite capable as a combatant for the 23rd century, is sitting right there.
The only viable role for this ship at the price point we've already baked into the design is as a big stick. The whole "fleet anchor" concept is IMO kind of silly and very RTS game inspired, but I suppose it is stated in the text of the quest so we have to accept it as canon. Either way, if we want a fleet flagship, then it being able to actually kill things is also useful.