Ehhh, it’s still a thing. I had burn in on my S9, and I babied that thing explicitly to prevent burn in. And that was after 4-5 years. My desktop monitors are nearly a decade old starting next year (wow, 1440p still has amazing staying power).

I’d definitely worry about burn-in if you have Teams open for nine hours a day and the taskbar on. It’s crazy to me that phones still burn in from casual use. :/