This guide is great,thank you for your hard work !!! But i would still add a few changes to MA classes...
SMs are a good SOLO PVP class......and thats basically it.I don't believe they are ,,arguably good'' for anything else,especially considering that you described Fighters as ,,pretty bad '' grinders.
Fighters with Big Bang Attack and Final Flash can farm way better than Swordsmans. Yes,they need special build to do so (and djfferent sets of weapons to be efficient),but SAME GOES FOR SM. Builds that have skills like Burning Attack or Flash Slash (grinding skills) are already ,,special builds" ,as they are not meant for PVP,which is main role of the class. Bcs Burning attack is eng based skill,SMs would also need eng crit % weapons for max dmg. Not to mention that Burning Attack is a complete joke without great weapon (+13 or higher).I have +12 sword on mine,and it does like 4k dmg without crit,at best (lvl 60 cap). Flash Slash is cool ,,in line" type aoe skill ,with decent dmg,but it only effects 4 targets.
My point is that Fighters are still better PVE class than Swordsmans,at least definitely for grinding,and for newbies that want to play MA,i would recommend Fighter over SM,anytime.
Now,tbh,i don't know much about dungeons (solo player) ,but i never saw anyone looking for SM in LFP chat (i did saw people looking for fighters ,maybe 3 or 4 times though)
First of all if you are interested in Swordsman I reccomend you to check youtube channel of best SM in game KinswkK.
There already was discussion about farming as SM here Swordsman PVE Video " guide " Papaya Farm and TMQ7. In my opinion SM is better at farming because he can one shot mobs just like Fighter BUT Burning Attack has 20M range while Big Bang only 10M and Final Flash is Straight Line skill making it even worse than those previous two.
As for dungeons I would pick SM over Fighter anytime because SM 30 prop debuff is very good for party while Fighter literally has 0 utility for party.
Thats why I think for PvE SM>Fighter be it for farming or dungeons.