There is a guy(Zmok on twitch) that runs +20's as prot pally and 4 dps, no healer. The prot self heals and spot heals the dps.
On a different note, i think the biggest issue i have is adapting to the fact that tanks have to kite so much at high keys and it takes most of your focus. This is the biggest hurdle for me so far with high mythic+.
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