[Miller]

Hey, 120-150 extra hp is nothing to scoff at. Whether it's on an evade build or not doesn't matter.

And one big issue with this is that we can't just put crit chance on strength because it makes no sense from a "lore" perspective. That's why I think changing the weapon stats themselves is the best method. Flat crit damage would make sense too though.

Raising your HP gives you some extra stat leeway but the amount of VIT granted by 'base' strength is only around 0.33 of one point of vitality. Average strength weapon crit build is gonna have around 20+ base; giving you a whole 6~7 points of vitality that you can distribute elsewhere. Strength does not offer as much HP as you are implying in your post, it's more of a range of 50-80 HP pre-giant gene/endurance. Keep in mind this is an archetype with incredibly low stat leeway, so a majority of STR crit builds are running 20 base VIT and can't spare anymore points unless they're fine with giving up Die Hard. 

Evade/Tank does matter within the context of HP. If you're more tanky, each point of HP is more valuable. 2 HP on a build with 50% DR is around 4. It's useful for both ends of the spectrum and there's no denying that, but tank builds benefit significantly more from higher HP values than someone not investing in DEF/RES. Of course, there's strong DR abilities like Wraithguard and parries that make up for this but that's besides the point.

I have zero idea what you mean by a 'lore' perspective either. You can argue that higher strength makes it easier to land a decisive blow thanks to being physically stronger and more capable of piercing through armor/kinks in their armor. Flat Crit Damage and Critical Damage would make as much sense as critical chance, but the issue with these two options is that they do not change the issue that this specific archetype faces which again, is stat leeway and only amplifies what they're already good at. (Less so in the case of Flat Critical Damage)