back in 3e (and even through today) one of the things I have found so funny is the combat mastery of being a thief (yes we changed name to rogue)Heh... you think this is 5E specific? Uh... nope! Not at all! ALL editions of the game had most of their mechanics be completely generic and only became what we think of them to be BECAUSE we layered fluff on top of them.
"What's that? When playing 3E I get +10d6 additional damage if I'm on the opposite side of a monster than my friend? By gods! That CAN ONLY MEAN that I've found a secret, sneaky location on the creature's body and stabbed it RIGHT THERE! THAT'S THE ONLY REASON WHY I DID SO MANY EXTRA d6s IN DAMAGE! IT HAD TO BE A "SNEAK ATTACK" from FLANKING!"
"But what if we say you are just really skilled and do that damage by just getting around the monster's guard? Couldn't you do that extra damage that way?"
"NO! NO WAY! SNEAK ATTACK! ONLY SNEAK ATTACK!!! HOW DARE YOU SUGGEST THE MECHANIC COULD BE SOMETHING ELSE!!!"
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back in 2e most fighters had weapon specilization (+1 to hit +2 damage) and the most common damage die was d8. You could not 'finesse' a weapon so damage came from Str that was normally higher on a fighter, and fighters got more attacks and specilization gave more too. so even when a thief (yes now called rogue) got a x2, x3, or even the mighty x5 backstabs they were mostly doing LESS damage than a fighter of equal level (not always but on average)
starting in 3e when +1d6 SA started (up to 10d6 at 20th level) adding dex to hit and damage on some weapons, and you often had rogues (still thief) doing MORE damage.
I have had many people ask "Why are thief/assassin/rogue/_____ better at finding openings to deal more damage then train warriors?" many time (sometimes to annoy me sometimes as new players really wanting to know)