system
Given the following post, respond as if you're commenting on Reddit:
human
[Final Fantasy] Why are martial artists doing so much damage?

I'm a white mage, and I'm in a party with a knight, a ninja, and a martial arts master.  We're pretty badass.  We just defeated Tiamat, which was no easy feat with no offensive spell power except that one lightning gauntlet we found in the castle of ordeals...which I really don't have time to use because I'm always healing somebody!   

Right now we're on a random dungeon crawl with outrageously hard bosses but tons of easy nuisance monsters and everyone in my party is doing crazy damage to everything!  We just fought a band of 4 goblins like the ones we killed as newbs in the forest outside Cornelia and each of the damagers in my party are inflicting at --minimum-- 15x the amount of damage it took to kill the same monster back when they were a threat to us.  

I mean, the ninja will decapitate one blue goblin in a single strike, and then cut off each appendage from the corpse and leave the whole graven package neatly skewered on a nearby tree branch.  Now, it's really cool that he can do this all in about 15 seconds flat, but once you've seen it about 80 times, it seems like overkill.   The master will hit a madpony with a paralyzing blow and then shatter every other major bone in its body with a serious of acrobatic and strength achievements that inspire awe...but again, far beyond the point at which the threat was terminated.  Our knight is far less elegant, but equally over-effective.  He just carries the biggest, sharpest sword he can find and bashes it into everything while grunting desperately until the creature is nothing but a fine red paste (or green, or purple, depending on what they bleed).   

As a guy who'se always conserving spell points and preparing to need more as dangers grow, I wish my comrades would realize it's a marathon, not an exhibition.  Why are they so overzealous in attaching weaker monsters?!
gpt
As a mage, you get better with study, but martial types need practice.

What you see as overkill, they see as a chance to practice techniques in real world but low stress situations. Drilling the techniques when they can pay attention to each muscle twitch means that they are perfected when fighting for their lives and needing to focus on tactics.