The only explanation I can think of for the Franklin that makes any sense is that she was a United Earth vessel (Scotty even says as such) that predated the NX-01 (hence the top speed of warp 4), and she was pressed into service in the romulan wars (2156-2160). After the war when the Federation was founded the Franklin remained in service and was folded into the newborn Federation and given the captain Edison.
Two date systems, one is the the year which ENT used as a stardate (and the Kelvin as well) and which it's possible the Vulcans still use in 2387. The other is the standard stardate system in use from after the Kelvin's time.
ENT just uses it as the date not as the stardate. The Kelvin timeline films have specifically said stardate 2233.04 2258.42, 2259.55 which isnt just the date, these are this universe's way of using stardates and so "stardate 2387" isnt just using the year it's using KT stardates and makes no sense if it were from the original timeline.
I mean it's not like Star Trek as a whole isnt without plotholes but it's not like the Kelvin films are airtight either.
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ENT just uses it as the date not as the stardate. The Kelvin timeline films have specifically said stardate 2233.04 2258.42, 2259.55 which isnt just the date, these are this universe's way of using stardates and so "stardate 2387" isnt just using the year it's using KT stardates and makes no sense if it were from the original timeline.
I mean it's not like Star Trek as a whole isnt without plotholes but it's not like the Kelvin films are airtight either.
Ahh I remember the Xindi and Romulans were mentioned but couldn't remember if it was just him or the Franklin