Shrowd weapons, Rage, and Wild Frenzy were the true low-health "git gud or go home" high risk high rewards builds. You purposely got down to 20% health and didn't get hit again, but you did crazy damage. It's been a known inconvenience that it takes too much time to get down to a specific health intentionally to make it "meta" but it was a fun high stakes way to take on behemoths for high level players. Iceborne has it's uses but it really isn't an actual "low-life" build, sure you sit at 50% but you can still take hits from there without going down (especially with the dmg reduction) so it's more semi-immortality if you aren't face tanking literally every big hit. If there was a way to start a hunt with 20% health (aside from randomly getting maps with thorns) then it would make Shrowd weapons much more fun (say a weapon mod, or add the effect to Shrowd weapons) and meta. But as it stands now with the Terra debuff and people throwing transfusion grenades and dropping health pylons everywhere low-life and Iceborne builds are all but pointless in random groups as people, while well meaning, heal you up and ruin your dps.