Threads like this, while a troll, do highlight how utterly useless the commendation system is.
If being graded by the game which is always fair and looks at raw numbers and stats, would cause anxiety and make the game less chill ...why is it a great idea to have random people with very little experience and biased views, grade you instead?
You might say the reason this is fine is because it becomes a nonsense-grade that no one takes seriously, thus it can't cause anxiety, but we then use this nonsense system to determine which players get a crown on their heads and the responsibility to mentor new players.
Perhaps you could make the OP's system an optional grading system, that you switch on if you want to go for combat mentorship. After all there's no reason to grade regular players just there to relax, but if you're aiming for mentorship that's a different story.
Or just scrap the commendation system entirely and remove the rewards from mentorship. Either way it needs a change badly.