I'll respond in bold and caps just because I can.

The first thing i miss is Notorious Monsters free roaming NMs that popped if you had an item to pop it at a set location or killed a set number of mobs to force pop a stronger version of the trash mob or the free roaming NM that pops every 6 , 12 , 24 ,36 hours. These are not required fights but are fun fights that could be had and even made as an achievement .
BOY IT SURE WAS FUN TO WAIT 15 MINUTES FOR A ??? TO POP AND FIGHTING OVER THAT POP WITH OTHER PARTIES

Death Penalty . I miss this because it made you try harder it made you put more effort in not dying . It Slowed level progress down a little do to loss exp on death . ( getting a 50 in less then a week is to fast ) It would be nice to add this in to slow level progression .
HELL YEAH LOSING A LEVEL DUE TO ENDGAME CONTENT WAS NOT TEDIOUS AND RAGE-INDUCING, SURE DID ENJOY HAVING TO JOIN AN EXP PT AFTER THE RAID
Weapon Skill Chains and Magic Bursts . I miss being able to link skills with other classes
HEY DERPINUS, YOU AT 100% TP YET? NO? OK JUST LET ME KNOW CUZ I'M SITTING AT 300% TP WAITING FOR YOU