Demetrios1453
Legend
To both of your "Do you disagree?", I'll say "yes". I don't believe that's enough to alter CR. Mainly because other species get perks as well that makes it a wash in the end. Halfling luck? Other elves' spells?So let's start with Drow:
Add Dancing Lights, Faerie Fire, and Darkness to an NPC statblock.
Faerie Fire gives advantage to you and all allies.
Darkness gives advantage to attack and disadvantage for them to attack.
Alteration to AC, attack bonus, and damage or not?
I'd say yes, it definitely has an impact on CR. Do you disagree?
Now Orc:
Adrenaline Rush: You can take the Dash action as a Bonus Action. When you do so, you gain a number of Temporary Hit Points equal to your Proficiency Bonus.
Relentless Endurance (1xday): When you are reduced to 0 Hit Points but not killed outright, you can drop to 1 Hit Point instead.
Adrenaline Rush: alters hit points
Relentless Endurance: Alters hit points, essentially allows you to live an extra turn.
I'd say yes, there definitely have an impact on CR. Do you disagree?
Assuming you either agree both alter CR, or at least you can see why some would think it might alter CR, can we now address the post I made to begin with which is IT WOULD BE NICE IF THEY INCLUDED THEM TO KNOW WHAT THE CR ALTERATION IS OR IS NOT AND THIS IS NOT IN FACT THE "PERFECT" WAY TO DO IT?
And Jeremy Crawford, as another poster has stated, agrees.