There is a misconception that the MacBook Pro displays are inherently better in every way over the Air's displays of either size. This is only true for the ProMotion and miniLED features on the Pro's (deep blacks are always welcome and a draw). But it ends there. I never used the HDR brightness on my Pros because Apple foolishly disabled the user color calibration option with these panels. If you use the workaround and calibrated with the on-board color calibrator, HDR features and brightness levels are disabled. I opted for bypassing HDR in favor of using my own color profiles versus sticking with Apple's awful, green-shifting and dingy factory calibrations (to my eyes).
The displays on the M2 Airs are a huge improvement over the M1 Airs, and the color vibrancy, white balance, pixel density and brightness (non HDR) look the same to my very picky and OCD eyes on either the Pro or the Air.
In fact, the Airs that I've seen don't have the film or overlay that Apple is using on the Pro's that cause a color shift when you look at the display off angle a bit (more noticeable on white backgrounds). This used to annoy me. Some panels shift pink which is easier to my eyes, but others shift green/dingy, which was unacceptable to me. I have also found that the white balance on my Airs is better than the Pros I've had. Of course, this can also vary from panel to panel even within the same model line.
It's all about what each individual wants and needs. For me, the thin and light form-factor of the Air line outweighs my desire for deep blacks (miniLED). ProMotion is a nice-to-have, but not a deal breaker for me as it's less noticeable on a MacBook than it is on an iPad Pro. If there was an option for a miniLED or similar on the Air, yes, I'd go for it, but the absence of this and or ProMotion does not make the Air's displays bad or inferior when it comes to color vibrancy, clarity, pixel density, white balance and brightness.
If you want and or need HDR, ProMotion and miniLED and a lot of processing power, the Pro is for you. If you don't need the heavy processing power and want a thinner, lighter, fast, fan-less, cool running, Mac with long battery life with a larger, high-quality display, the 15" MacBook Air is for you.