I miss the danger of FFXI.
Needing to sneak and invis to go to random sections of the map to do a huge battle, that dread of being low level and feeling my controller shake as I realize that I'm near the NM Bloodtear Baldurf, going to the Temple of Uggalepih without clearing my Tonberry hate and getting one shot by Everyone's Grudge, beastmen zones having puzzles that you have to navigate, like having to mute yourself so you don't get cursed by the Quadav artifacts. Part of that is what made exploring maps so much fun, never knowing what could kill you.

You're not even always safe as a "higher" level!
I was in the Palbourough Mines once and accidentally aggro'd an EP from that was behind a gate on the strong side of the zone and next thing I know, it linked up with every quadav as it ran to where I was and suddenly a bunch of low level quadavs surrounded me and murdered me. It was surreal and hilarious.

I miss Besieged, even though the height of that was when I still played on PS2 and that was rough lol. Just a bunch of high leveled heroes fighting off an onslaught of varied strength enemies as they attack a hub city.

I really enjoyed how fun and interesting the jobs were and the cool combinations you could get with subjobs. I miss the FFXI Dancer and dual wielding daggers and throwing up NIN shades while drain sambaing the life out of mobs. COR support was so fun, I loved the gamble of if you roll the correct numbers for the skill proc. I loved as a SAM memorizing the skill chain chart so that no matter who I was in a party with, I could do a skill chain with their weapon of choice and seeing the insane numbers that came from that + the magic burst from the caster. I loved PUP being able to have them be tank/DD/healer/Caster all the while punching baddies alongside it. I even miss 2hrs.

That being said, the struggle of the game was fun because of the company I had, otherwise, I may not have had the patience to fall head over heals for that game.