If you're not taking any burst damage and still die then you are simply not getting enough heals. If you're not getting enough heals, you're likely not going to get out of purgatory easily unless you have DP available. In that situation Lichborne could have been a better option.
And if youre not in any danger at all, then what does it matter? You're not going to proc purgatory and you're not going to need lichborne, so it's kind of a moot point.