1. Depends how they are calibrated. I agree with that if we look at Samsung phones. iPhones are great.OLED has bad color accuracy, low maximum brightness, high battery draw at high brightnesses. Micro fixes all of those while retaining OLED’s deep blacks.
2. The brightness is still better than standard LCD screen.
3. Probably much better than LCD + offering much more nits. 1000 to 2000 nits is more than enough. Otherwise your eyes will melt.
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4. Burn-in is an issue, but not like 10 years ago. If you are using your screen "normally" you should not have any issues at all. My old Note9 (Got it day 1 back in the hot summer of 2018) has zero burn-in.