@jayfry I don't have a 2.8 screen but I do have a 3.5 tft from adafruit. I never tried it on a pi3 befor so I installed retropie 3.8 on it and was able to set up the screen using adafruit's guide. I would double check the /boot/config.txt for the correct HDMI settings. Fat-fingering something there can cause it not to display on the tft screen. Also about the Device Tree. It is set on by default as of January 2015. This link from raspberry pi forums will explain it. https://www.raspberrypi.org/forums/viewtopic.php?t=97314. Let me know if this helps.
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