[cmrdporcupine]

Why even assume multicelluarity as some kind of inevitability?

Hell, it took 2 billion years to get to single celled eukaryotes on earth. But the earth was teaming with prokaryotes the whole time, two entire separate branches of them, too, and they seem to have sprung into existence almost as soon as the earth cooled enough.

There's still a lot more of them in terms of total weight than animals and protists. A lot.

[psadri]

It’s not inevitable. I was simply stating the most probable form for the life that DID get that far.