There's a bandaid adjustment to 60% grievous wounds that we pushed on last deploy that hopefully hits on some of that. Finding a more elegant systemic long term solve to healing is something that the team has been thinking a bunch about. Eg. GW Component / GW Juice (this one is probably bad idea though), stacking GW debuff over time, globally healing modifiers and rules that are clear, etc. All this to say we agree.
Champs like Mundo and swain have pretty middling placements overall, but some combats can feel pretty beyond the pale, that's for sure.
Ideally we find a solution that doesn't hit small amounts of healing (which would have pretty dire consequences for the mode), but hits healing when it starts to go giga infinite.
Going giga infinite is also a major draw of rogue-like style gameplay fantasy so it's a fine line to make sure we don't overdo it.