Counterpoint. I basically made the same upgrade as you, 2014 instead of 2015 and 16” instead of 14”, and I love the screen. But you’re correct that people have different reactions to screen technologies, lots of people love the iPhone OLED screens, but there are also people who don’t. For some people the MBAs’ LED screens are better than the MBPs’ Mini_LED screens.I don't understand why everyone is so enamored with the Macbook Pro screen.
I bought the 14" M1 model Macbook Pro when it first came out. I jumped on it. Finally, a replacement for my 2015 13" Macbook Pro. With Magsafe. But NO!
I saw a weird shimmering or glossiness on the screen. It's kinda hard to describe. It's especially noticeable when even slightly off axis. I couldn't stand it. Fortunately my daughter was eager to take it off my hands. I don't think the effect was because of the backlight PWM that people were complaining about, but maybe it was?
I recently went in to an Apple store with my old 2015 13" machine and compared screens against an M2 Macbook Air. Once I adjusted the newer machine to IIRC sRGB, the screens were very similar. I didn't feel the weird annoyance I previously had with the 14" Macbook Pro screen.
I now need to take my 2015 Macbook Pro back in and compare screens against the new M3 Macbook Air. Hopefully the display didn't change from the M2 version. My old machine is on its last legs, throwing up messages such as "Volume Hash Mismatch". I desperately need a replacement.
tl;dr: I like my old 2015 13" Macbook Pro screen much more than the M1 14" Macbook Pro screen.
All that being said, I hope you love the M3 Air’s screen.