Plasma was great back in the day, but is not very energy efficient and as you say, The bezels around the screen and the casing are often just a few millimeters thick for OLED.
We use the LG OLED 55″ and no sign of Screen Burn and had TV for must be 3+ years thus far 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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