Yes.
You can't see the colour when you're using it so what's the point if you've already got one
That's not true. You can see the color around the edges of the screen, as well as any time the phone is face down, even with a case.
Color does matter otherwise Apple wouldn't let you choose from colors.
I'm going to offer probably what is an unpopular opinion.
I wouldn't use this opportunity just to trade in for a different color. While monetarily it's free, there is ecological consequence, so let's not keep refining our skills of bending to consumer desire that much. Just live with what you currently have.
This frankly isn't ideologically consistent unless you make a very conscious effort to only upgrade your phone when absolutely necessary (perhaps when your version of iOS stops getting security updates), which means you'd be on iPhone 6S until quite recently. You'd also have to avoid using electricity just for entertainment purposes.
The ecological damage done by returning an iPhone that will certainly be simply sold to someone as a refurbished device (for which there is plenty of demand) is basically just the cost of shipping the parcel. I think it would be hypocritical to view this as unacceptable unless your carbon footprint is already as minimal as it can be.
Honestly, from a moral perspective one might even argue that having an iPhone 15 Pro is a moral hazard to begin with, since an SE would do more than what you actually "need", and you'd have $1,000 or so that could be donated. Since it's estimated that it takes well under $1,000 to save a life, someone purchasing an iPhone Pro is... In a convoluted way... Placing their phone desires above the life of another human... Kind of messed up. Makes me want to sell all my tech.
