The problem with upscaling the output on the Wiz to a TV (sharing the same framebuffer as the OLED), is it requires a landscape framebuffer, which requires the OLED controller rotation, which causes the tearing (someone wants slapping for that design decision - the controller datasheet explicitly says rotation is not available when in external clock mode).
On the other hand, you can control the TV out separately from the internal screen (give each it's own framebuffer), which would allow for higher resolution TV output if desired (emulated system native makes most sense), and use of the OLED for something else while in that mode (virtual keyboard maybe?).