Depending on the specific TV, small details like text rendering can be god-awful.

A bunch of TVs don't actually support 4:4:4 chroma subsampling, and at 4:2:2 or 4:2:0 text is bordering on unreadable.

And a bunch of OLEDs have weird sub-pixel layouts that break ClearType. This isn't the end of the world, but you end up needing to tweak the OS text rendering to clean up the result.