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> Even my current macbook pro isn't that good outside.

There's a hack for that. Involves running a full screen transparent overlay which tricks the OS into letting you turn the screen brightness all the way up. Silly that it's necessary but works very well. I don't remember the name of the program.

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Trying to outbright the sun on a battery powered device just results in displays w/ burnt-in screen elements and a dead battery.

Leaving the charger connected while doing this is a good idea, yes. Presumably the screen will die eventually, but maybe not if Apple spec'ed it sufficiently well. No hardware lasts forever anyway.

I think you're referring to the Vivid app, which I find works very well for this purpose with recent Macbook Pros: www.getvivid.app

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