I have an iPad 8 which I'm very happy with. I was curious what the highest resolutions on YouTube were. I came across this video:
which I can play at 4320P or 8K on my computer (albeit not super smooth). My iPad does not even show that resolution in the menu for that video. It's highest is 2160P 4K. I'm not knocking the iPad and I realize that those high resolutions are overkill on an iPad. I was just curious that 8K was not an option on it.