That's exactly what they're doing: the assets are going to be streamed and then probably cached in RAM, thus you need a lot of RAM.
Of course this makes me think that FS2024 is going to get live-serviced and killed at some point when they decide to stop hosting all that data and welp so much for your game you bought, too bad.
Probably just uncompressing a lot of stuff and pulling data from the internet and having to keep it without any cleaning
save