Questions about stats

[Aerosfilis]

I've looked up around to understand how stats work and I have the gist of it but I'm still curious about some details.

From what I understand, Dexterity is your chance to do Precision strike, critical hits, with a chance of triggering one at (3 * dex) / (raw + elem).
Precision strikes being a 150% damage, that would mean the effective damage is (raw + elem) * (1 + 0.5 * 3 * dex / (raw + elem)) (the 0.5 being from the 150% crit, change that to whatever crit you make with the different bonuses available).
So first question is, is that correct? I couldn't find proper affirmation that raw and elemental crits were the same, but it seems like it. Making sure
Second one is that after simplifying the formula, that would give : raw + elem + 0.5 * 3 * dex as the effective damage, soooo in a way, raw & element don't directly affect crit does it? Yes it affects your chance to crit, but if you only look at effective damage, that completely changes how you see it and dexterity because more of an extra stat that deals damage, building up a lot more than raw or element (since the base would be +1.5 dmg per dex, without any other crit bonus).
As for MH, it's a lot more complex than that, depends on the bonuses you have for Precision strikes and if you have some that only activates on precision strikes, ofc you'd care more about the chance to land a crit than the effective damage but that's another topic.

Other point I'm really not sure about is for defense, coming from MH, I know you can calculate how much damage in % you will take, so assuming you can do a bit of math, it's a tangible logic to follow and compare armor. But I can't seem to find any info on that for Toukiden. Which makes me really confused as to how good an armor might be without just giving it a try and have a feel for it. I would love to get some insight as to how important is defense, how it works and how many more points do I need for an armor to be more interesting than another when taking elemental res and aegis into account.
Actually, a bit of insight on Elem res would be nice too, for the same reasons

Last one is Aegis, I can't remember where I read it, but it seemed to be that Aegis / 10 is the recovery rate (recoverable-health per second). I'd love a confirmation on that.

And I think that's it.
Basically I'm a lot into the data in Monster Hunter and I'd love to get a better feel of the stats in Toukiden too.