Everyone is giving non-answers to your good-faith question, so I’ll try and estimate when the MBA will get a better/brighter screen as best I can.
While the regular iPhones inherit “Pro” features quite regularly (OLED 3 years after the X, Dynamic Island 1 year after the 14 Pro, higher and lower refresh rates 3 years after the 14 Pro), Macs and iPads stay differentiated for longer. They’re not always updated every year, and they face less competition than exists in the phone space. For example, the MBA is already the ultralight for most consumers. Why add a pricier screen that only a few are clamoring for?
But they will get around to it eventually. The rumor-mill seems to believe that the MacBook Pro will be getting its first major redesign of the Apple Silicon era next year, five years after the Mini-LED model launched. It will likely adopt thr tandem-OLED display from the iPad Pro. It may also be thinner and lighter, and might suit your needs better.
After this, in Spring 2027 or beyond, Apple’s 2022 MBA design will also start to look stale. At this point, I believe the MBA (in addition to the iPad Air) will be redesigned and finally adopt some of the display technologies from their Pro siblings. Perhaps Mini-LED, perhaps single-sheet OLED, but certainly something more advanced than the LCDs they’ve been using for years.