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Modern OLED tech is exceptionally resilient to burn in these days. Not saying it can’t happen - but it takes thousands of hours on a static image at max brightness to start seeing burn in on something like a Nintendo Switch OLED - and burn in is incredibly rare on iPhones. Most devices have built in tools like refreshing and pixel shifting that’s invisible to us but really keep the burn in risk to a minimum even with static elements like a menu bar, etc.
The best pixel shifting can do is blur the edges of the burn in. It doesn’t prevent the burn in from happening.

Computer usage has lots static elements on display for a long time, which is the worst use case for OLEDs
 
A future iMac 🖥️ with an OLED screen larger than the current 24” would be great!

Bring back the 27” or make it 30”!
Depends on the OLED tech they use for the display. The tandem RGB OLED panels used in things like the iPad Pro are extremely difficult to manufacture at sizes above that of a laptop (and even then that's fairly recent). The technology needed to produce these for an iMac at 24" let alone 27" or 30" isn't ready yet.

Larger displays including TVs use a different OLED technology where the OLED layer is all-white and it has a color filter or quantum dot layer applied over it for color (called white OLED or WOLED). These are considered inferior to RGB OLED dual layer/tandem panels, but that doesn't mean Apple wouldn't consider them for the iMac.
 
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The best pixel shifting can do is blur the edges of the burn in. It doesn’t prevent the burn in from happening.

Computer usage has lots static elements on display for a long time, which is the worst use case for OLEDs
Have you looked into tandem OLED as is used in the iPad Pro? It has two layers of OLED which uses half the power to a pixel to produce about the same brightness. The result is a strong resistance to burn-in.
 
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Considering a 13" Macbook Air as a travel machine (I have a 16" MBP M3 Max for 'real' work). If the expectation isn't for it to get OLED for 2+ years then it seems viable to purchase now. I'll be getting from apple refurb so the "new" M5 version won't be available on there until the end of the year anyway.

Any noise that despite keeping LCD that the next Air might get promotion anyway?
 
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