Agreed with that, sadly in games with Multiplayer they use to limit the number of summons to a minimum.
In NWN they did it so you do not pull too much to the server.
Diablo 2(2000) allow you to have 50+ minions and had multiplayer. The PRC servers on NWN1 allow multiple summons.
Also keep in mind that stop time is extremely disturbing for the MP and instead of removing, NWN1 just allowed a server to disable it.
But honestly, i rather
NOT having necromancy than having it completely nerfed. NWN2 was my first contact with 3.5e warlock and i thought "why someone would use this class, all invocations are worthless and the eldrtich blast is just a bow that misses a lot. HE is just a archer with a worst BAB". After i finished the game, i decided to see the mods and when i played with warlock reworked, i loved so much that even read complete arcane despite not having a group to play 3.5e from long years.... Imagine how much frustration someone who enjoys play as a necromancer and finished BG1/2 as one or play 5e as one and "cool, i don't have a P&P group anymore but at least i can play on my PC" and after like
40 hours to get animate dead(assuming that the game is 80 hours long), he can only have a single weak skeleton...
That would be the most frustrating thing in a game ever.
I asked for then on reddit AMA and got no answers from Larian. (
https://www.reddit.com/r/IAmA/comments/fhk1u3/im_swen_vincke_creative_director_at_larian/fkbldlo/ )
After searching, looks like there are ZERO answers about multiple summons So i an assuming the worst.... Lets hope that BG3 will be mod friendly and so people will fix necromancy(that will probably come broken)