Oof -
Would this be amazing? Yep. Is it implementable - nope.
The moment we are talking multiplayer - youre talking server space. PlanCo has like zero zerver space from the frontier side of things - at least in comparison to Elite Dangerous or even the minimal amount of server space provided to PlanZoo. This would require Fronteir dropping a bunch of cash on well in their product cycles - is a rather old title.
Unless then you want to talk about "hosting" which would - well then bring in problems due to Denuvo and all that great stuff.
This is also core game feature level of design. You dont really slap this in 4 years into a games life-cycle, as your engine most certainly hasnt been built around that concept.
There is a LOT to go into making something multiplayer, especially when we are talking about editting spaces.
I'd encourage you to keep pushing for it in future titles (I mean even Planet Zoo is a step forward in "online" play) , but I can promise, promise, promise, promise PROMISE you- you wont see PlanCo go MP in this product run.
I guess im encouraging everyone to remember where we are in the life of this game, and that the best we can ask for is dlc content, and QOL updates that are managable by a team that gets smaller as the game gets older.