Elite does have this, on player-controlled Fleet Carriers. NPC station markets are directly influenced by player-supplied items as well, though it’s not a 1:1 translation.
I genuinely enjoy multiboxing. It may be a less immersive experience, but the conveniences outweigh the reduced immersion for me. I don’t see how singleboxing would provide both. Having played Elite, there’s times where I wish I could effectively multibox, or have alts in different areas of the game. There’s an incredible amount of tedium involved with the increased immersion.
I started with Elite before I came to Eve, and I stopped playing Elite because Eve has more depth to the economy and mechanics. Elite has more breadth to the explorable universe.
Mining in Elite was cool af though, sometimes I want to bring my Python out and do the laser + limpet minigame again.
Wasn’t Eve: Valkyrie kind of close to what OP is describing?