My 65" B7 from 2017 is still going strong. No dead oleds. Still feels sufficiently bright in my room.

I've heard newer models are significantly brighter and have "better" HDR but I don't see any need to upgrade any time soon.

I also don't really baby it. I've left roughly still scenes up on the screen for 15 - 60 minutes before it automatically went to sleep and no burn in yet thankfully.

I regularly game on it and no burn in of the static elements of the UI.

Edit: I said burn in but I mean image retention.