I would of done ... FFXI ( lv75 cap era ) - I would of re-mastered. Period.
It all worked. Camping NM's - eventually rewarding, unique rare items, fun extreme rare items ( Kraken Club ), fun items (Ridill, Joy-toy etc). Variety of decent equipment. Crafting Armour was also useful!!!
Accomplishments, raging from easy to extreme.
Crafting worked. It paid off.
Auction House. It worked.
Fun story line / fights.
Fishing: Was fun - Fishing Devil manta for angel skin, yum.
No stupid retard vanity transports.
Items were job relevant and fun, with stats that made you go... I want that ( Getting that Black belt for a monk? wicked )
Experience parties (Might have lowered the requirement and speed of leveling easier).
Open world Notorious monsters - Server competition. Rewards.
Combat: Getting the Armour made a significant difference. Worked. Maybe adjust speed but damn I preferred it.
Punishment for being retarded : Sneak / Invis
That element of danger from other monsters. They could that level of danger or excitement to the game!.
The hidden secrets / strategies etc that went into the game that S.E. wanted us to find / figure out.
I'd of had to hardly change anything, expect a few systems here and there to align with current trends. Old is where it's at.
I'm just an old-school guy, wishing times didn't change I guess.