This is the so called "Prime" Timeline. What is the original Star Trek is the "Alpha" Timeline.For me, different timeline is the least complicated explanation. It kills the need for “what did the Enterprise look like at this point of TOS?” discussions.
They are separate timelines where the broad strokes remain relatively similar.
The "Kelvin" Timeline was born out of the Prime timeline, not the Alpha Timeline.
I know that is the first thing that hit me. Why couldn't they have at least gave a nod back to the more functional slanted panel. How difficult for that poor transporter chief. Red Shirts always get the shite end of the stick.I like the overall look, but I do wish the control panel were angled upward. That just looks miserable to use standing up.

believes or states is canon with this series and direction from CBS. The only real way to rationalize what they've done is separate timelines. So, Alpha timeline happened, then when Spock went back in time, and the Romulans went back in time, the Kelvin universe was born. But because of the birth of the Kelvin timeline. But that Spock wasn't the Alpha timeline Spock, but was the Prime timeline Spock. So Alpha timeline is a closed system. It could be argued that at the end of TNG when time was unraveling that Picard and Q somehow gave birth to the Prime timeline when the universe was devolving, and subsequently put right. That originally without B's intervention, the Alpha timeline was to end, had he not got involved. Assuming the Q exist with access to all realities. So that is how I at least rationalize it. So yes, the Prime timeline is birthed from the Alpha, but it isn't the Alpha. Its new and better tech is a result of the reformatting of the universe, by Picard's actions to undo it's erasure.