One thing that wasn't mentioned is the max sustained screen brightness for SDR, which is higher on the M4 Pro (1000 nits) compared to the M4 Air or M1 Pro (500 nits).
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No; you can adjust screen brightness just fine with the built-in settings, including with the F1 and F2 keys (plus the Fn key if you've got them set that way).
This Vivid app is specifically for extra HDR levels of brightness. I've never had a problem with my M1 or M4 MBPs, either inside or outside, with the built-in brightness levels. (But, to be fair, I don't use it outside a lot.)
It's not what is implied by the parent post - where the mac is limiting the brightness only to have the app unlock it.