BG1 = Multiple summons
BG2 = Summon cap = 5 and people HATED it
BG3 = Single summon????
*cries in druidic*
Cries in Abyssal.
Seriously. All, I REPEAT, ALL popular necromancer characters in fiction has armies and armies of created undead at his disposal. Single summon limit kills the fantasy of being a necromancer so much that serves only to cause frustration to the fans of necromancers.