If my tank is racking up damage or diving into the enemy pretty much solo, it is my choice about how much I leave their survival in their own hands, if I have the space to even make that choice of healing them.
If my alternative is to off-angle or flank, are there certain things I should observe to make that decision?
And when would it generally be better to do something other than pumping heals to farm my ult, if my tank is being focused?