Why?about NPC

Hello mojang just want to say why did you removed npc from the game cuz i had summoned one in my world then i update the game ive gone to game then i saw there is no command to summon npc ive gone to my old npc it was still there and i can edit it now.pls add them soon. Do you agree if i want to make a server like minplex?

Thx
Max
Smit