It is true that Factorio is currently a better game and I suspect that will be the case even when Satisfactory is complete. I don’t really think it’s intended to be a 3D Factorio (even if that’s the easiest way to describe it): it seems that the design is to be less intricate as a construction management game, but with more details in the world design and player exploration: there are elements of No Man’s Sky or Astroneer that are absent in Factorio. So I am still curious to see where the devs will take it.
Satisfactory is cool, but at no point do you get the "ok so I built this entire factory and now I can just replicate it modularly" - no, just place every, single, block, by, hand.
To me factorio is a rethinking of the RTS game, satisfactory is like a really nice minecraft mod.
Now, granted, they might change their minds -- but it's hard to imagine how blueprints would work. Factorio is played on a 2D plane, with few obstacles in general and none that can't be removed; Satisfactory is played in a 3D world with immutable obstacles.
The game is tuned towards not needing blueprints. You don't need large quantities of anything, just a small amount of every item -- the complexity scales up, but the scale itself kinda doesn't. Yes, some players will attempt to turn the entire output of the map into turbo-motors, producing exactly the right amount of every ingredient, and will build their factory in the sky to avoid dealing with the terrain--
And yes, blueprints could be useful in this specific case. But that's not most players.
Which is ironic considering a big part of the original inspiration for Factorio was factory building mods for minecraft.
It's also ridiculously stable, in the ~thousand hours I've played I've never had a crash or a game breaking bug.
Meanwhile satisfactory puts you on a fixed-size map and will slow down to a crawl once you build too much. This limits a lot of the things you can do in the game.
Satisfactory has more elements of a traditional open-world action game (that just happens to borrow factorio's factory system).