I mean they have been rolling out updates and fixes since launch, couple of content packs, balance tweaks, reworked a number of systems...
They're currently working on a scenario, WW2 Pacific, sounds at least broadly similar to the kinds of scenarios in earlier Civ games, in concept.
I would hope that after that, they can eventually get to something approaching proper mod tools.
Yeah, it was a bit of a buggy mess of a launch, no arguing that, but they have been and are still just slowly refining and improving the game.
Of the seemingly fairly small number of people still playing it... Recent Reviews = Mostly Positive.
Personally, I don't know why you'd play any deep strategy game multiplayer.
Every time I've tried multiplayer, in any 4X / Grand Strategy game... everyone is annoyed that I am taking too long, to, you know, evaluate this considerably complex strategy game, with tons of potential upside to taking your time to micro manage things.
If I am able to take my time, I tend to snowball and by mid or late game, be either winning to the point everyone else quits, or be the only reason why a group of players vs group of AIs game has not totally fallen apart yet.
But I am one of those apparently rare people who plays single player on the biggest maps and slowest time scales my system can manage...
... I just have way more enjoyment that way, and I appreciate that the AI in Humankind at least seems to me to be generally better at playing the game than most AIs in most 4X / Grand Strat games, when the player and AIs are on an equal footing in terms of bonuses/maluses.