I had a similar experience in my 5e game, no real combat but basically the intrigued that drove the game got tenfold more complex and was revealed to involve each member of the party in a varying but believable way.
Seperatly, I also played Alice is Missing the month before and it lived up to the hype I wanted, but it's very up.my street. What I seek in an RPG is being able to move between being immersed enough to feel what my character feels when I want it, but when I don't, be able to act as my own drama maker for later. AiM absolutely delivered that for me. It also didn't need magic or tech to deliver any agency which is a big plus to me.
I think modern TTRPGS in general steer towards things like temporary summons because of how it lets the players actually use them in combat. Nobody wants to play the necromancer who is suddenly just some guy because there are no corpses available where the battle kicks off.
I have an enormous soft spot for narratively putting in the legwork to assemble your undead hordes, and when I'm the GM, I'm always keen to set up good moments for the necromancer to build an army, but it's so easy for that to set up a situation where a player doesn't get to actually use their features. Making them temporary summons from nowhere in particular is the easiest fix.